Suppose the quantity demanded weekly q (in units of a thousand) of a product is related to its unit price p (in dollars/unit) by the equation 100q 2 + 9p 2 = 3600 What is the rate of change of the quantity demanded when the unit price p = $14 and the selling price is dropping at the rate of $.15/unit/week?

Answers

Answer 1

The rate of change of the quantity demanded when the unit price p = $14 and the selling price drops at the rate of $.15/unit/week is approximately 0.189.

We are given the equation for the quantity demanded weekly q (in units of a thousand) of a product which is related to its unit price p (in dollars/unit) as

100q² + 9p² = 3600

We need to find the rate of change of the quantity demanded when the unit price p = $14 and the selling price drops at the rate of $.15/unit/week. The given equation is

100q² + 9p² = 3600

Let's differentiate both sides concerning time t.

d/dt (100q² + 9p²) = d/dt (3600)

=200q (dq/dt) + 18p (dp/dt) = 0

Divide both sides by 2 to get the rate of change of

q: dq/dt = - (9p/100)(dp/dt)

Substitute p = $14 and up/dt = -$.15 to get the rate of change of

q: dq/dt = - (9 x 14/100) x (-0.15)

= 0.189

The rate of change of the quantity demanded when the unit price p = $14 and the selling price is dropping at the rate of $.15/unit/week is approximately 0.189.

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Related Questions

Slabs of meat 0.0635 m thick are to be frozen in an air blast freezer at 244.3 K (-28.9 °C). The meat initially at the freezing temperature of 270.4 K (-2.8 °C). The meat contains 75% moisture. The heat transfer coefficient is h= 142 w/m2K. The physical properties are rho=1057 kg/m3 for the unfrozen meat and k=1.038 W/mK for the frozen meat. Calculate freezing time.

Answers

To calculate the freezing time of the meat slabs, we need to consider the heat transfer coefficient and temperature differences. The freezing process involves heat transfer from the meat to the surrounding air in the freezer, leading to a decrease in temperature.

First, we need to calculate the temperature difference (ΔT) between the meat and the surrounding air. The initial temperature of the meat is 270.4 K (-2.8 °C), and the target temperature is 244.3 K (-28.9 °C). Therefore, ΔT = 244.3 - 270.4 = -26.1 K.

Next, we can calculate the heat transfer rate using the formula:

Q = h * A * ΔT

To calculate the surface area (A) of the meat slabs, we need to know the dimensions. The thickness of the slabs is given as 0.0635 m. However, the length and width of the slabs are not provided in the question.

Once we have the heat transfer rate, we can determine the freezing time by dividing the heat required to freeze the moisture in the meat slabs by the heat transfer rate. The heat required to freeze the moisture can be calculated as:

Q_freezing = (0.75 * weight_of_moisture) * latent_heat_of_freezing

The weight of moisture and the latent heat of freezing values are not provided, so we cannot determine the exact freezing time without this information.

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Problem situation:
Anna is at the movie theater and has $35
to spend. She spends $9. 50
on a ticket and wants to buy some snacks. Each snack costs $3. 50. How many snacks, x
, can Anna buy?

Inequality that represents this situation:
9. 50+3. 50x≤35

Answers

Answer:

Amount of money Possessed by Anna = $ 35

Money spent on ticket = $9.50

Money spent on Snacks = $ 3.50

Let x number of snacks, which will be least number of snacks that Anna can buy.

transforming the situation in terms of inequality

→9.50 +3.50 x≤ 35

→9.50 -9.50+3.50 x≤35-9.50

→3.50 x≤25.50

Dividing both sides by 3.50, we get

→x≤7.3(approx)

which can't be number of Snacks, as it will be an integral value.

So, minimum number of snacks with given amount of money = 7

So, Anna can buy snacks(x)={x:x≤7,x=1,2,3,4,5,6,7}=At most 7.

Step-by-step explanation:

Answer:

She can buy up to 7 snacks.

Step-by-step explanation:

9.50 + 3.50 x ≤ 35

Subtract 9.5 from both sides.

3.50x ≤ 25.5

Divide both sides by 3.50

x ≤ 7.29

Since the number of snacks must be a whole number, the maximum number of snacks she can buy is the greatest whole number less than 7.29 which is 7.

According to Bankrate, the best rate for a savings account in July 2020 was through Vio Bank paying 1.11% APY. If the stated or nominal interest rate is compounded monthly, find the stated interest rate equivalent to 1.11% APY. Use algebraic methods. Round to the nearest hundredth of a percent. (Source: https://www.bankrate.com/banking/savings/rates/)

Answers

The answer is 11%.

We use the formula to find the nominal interest rate:

A=P(1+r/n)^(nt),

where: A is the balance, P is the principal, r is the annual interest rate, n is the number of times the interest is compounded per year, and t is the time in years. In this case, P = $1,000, r is unknown, APY = 1.11%, and n = 12 (since the interest is compounded monthly).

Then we substitute these values in the formula and solve for r as follows:

A = P(1+r/n)^(nt)  $1,011 = $1,000(1 + r/12)^(12×1)   $1,011/$1,000 = (1 + r/12)^12  1.011 = (1 + r/12)^12

Taking the 12th root of both sides:

12√1.011 = 1 + r/12 12√1.011 - 1

= r/12  r/12

= 0.0091685587345143

r = 12 × 0.0091685587345143  

r = 0.11002270581417...

To the nearest hundredth of a percent, the stated interest rate equivalent to 1.11% APY is 11.00%.

Therefore, the answer is 11%.

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A parallelogram whose angles measure 90° is called what?

Answers

A square

Hope this helps!!
the answer is a square

Two coins are tossed and a spinner numbered from 1 to 8 is spun. What is the probability that both coins land heads up and the spinner lands on a number less than 3? a. StartFraction 1 over 32 EndFraction b. StartFraction 1 over 16 EndFraction c. StartFraction 1 over 8 EndFraction d. One-fourth

Answers

The probability is 1/16, which is equivalent to the fraction StartFraction 1 over 16 EndFraction. Therefore, the correct answer is (b) StartFraction 1 over 16 EndFraction.

To find the probability that both coins land heads up and the spinner lands on a number less than 3, we need to determine the individual probabilities of each event and then multiply them together.

The probability of a single coin landing heads up is 1/2 since there are two equally likely outcomes (heads or tails).

The probability of the second coin also landing heads up is also 1/2, as each coin toss is independent.

The probability of the spinner landing on a number less than 3 is 2/8, or 1/4, since there are two favorable outcomes (1 and 2) out of a total of eight possible outcomes.

To find the overall probability, we multiply the probabilities of each event:

P(both coins heads up and spinner < 3) = P(coin 1 heads up) * P(coin 2 heads up) * P(spinner < 3)

= (1/2) * (1/2) * (1/4)

= 1/16

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can anyone help me with this question as soon as possible please.

Answers

Answer:

2.1 cm

Step-by-step explanation:

Length of an Arc = θ × (π/180) × r, where θ is in degree.

Bottom Arc: 120 x (3.142/180) x 5 = 10.5

Top Arc = 120 x (3.142/180) x (5+1) = 12.6

Answer  = Top Arc - Bottom Arc

= 12.6 - 10.5

= 2.1cm

Answer:

2.1 cm

Step-by-step explanation:

If there are 2 arcs with the centre O, that means that O is the center of the "imaginary" circle.

So, we can use the regular arc length formula:
[tex]2\pi r(\frac{?}{360})[/tex]

with the ? being the central angle.  The central angle in this case is 120 degrees.

So, first let's find the small arc length:

[tex]2\pi (5)(\frac{120}{360} )\\10\pi (\frac{1}{3} )\\10.5[/tex]

Next, the larger arc:

[tex]2\pi (6)(\frac{1}{3} )\\12\pi (\frac{1}{3})\\ 4\pi \\12.6[/tex]

Next, subtract the 2 lengths:

12.6-10.5

=2.1

So, the larger arc is 2.1 cm longer than the smaller arc.

Hope this helps! :)

Find the limit (enter 'DNE' if the limit does not exist) (-5x + y)² 25x2 + y² 1) Along the x-axis: 2) Along the y-axis: 3) Along the line y = x : 4) The limit is: lim (x,y) (0,0)

Answers

1) Along the x-axis: The limit is 1.

2) Along the y-axis: The limit is 1.

3) Along the line y = x: The limit is 8/13.

4) The limit does not exist.

To find the limit as (x, y) approaches (0, 0) of the given expression (-5x + y)² / (25x² + y²), we will evaluate the limit along different paths.

1) Along the x-axis (y = 0):

Taking the limit as x approaches 0 while y is fixed at 0:

lim (x,y)→(0,0) (-5x + y)² / (25x² + y²)

= lim x→0 (-5x + 0)² / (25x² + 0²)

= lim x→0 (-5x)² / (25x²)

= lim x→0 25x² / (25x²)

= lim x→0 1

= 1

2) Along the y-axis (x = 0):

Taking the limit as y approaches 0 while x is fixed at 0:

lim (x,y)→(0,0) (-5x + y)² / (25x² + y²)

= lim y→0 (-5(0) + y)² / (25(0)² + y²)

= lim y→0 y² / y²

= lim y→0 1

= 1

3) Along the line y = x:

Substituting y = x into the expression:

lim (x,y)→(0,0) (-5x + y)² / (25x² + y²)

= lim (x,x)→(0,0) (-5x + x)² / (25x² + x²)

= lim x→0 (-4x)² / (26x²)

= lim x→0 16x² / 26x²

= lim x→0 8/13

= 8/13

4) The limit:

The limit as (x, y) approaches (0, 0) along different paths gives different values (1, 1, and 8/13). Therefore, the limit does not exist.

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Complete question is below

Find the limit (enter 'DNE' if the limit does not exist)

lim (x,y)→(0,0) (-5x + y)²/(25x² + y²)

1) Along the x-axis: 2) Along the y-axis: 3) Along the line y = x : 4) The limit is:

Find all value(s) of c such that the area of the region bounded by the parabolas x=y 2
−c 2
and x=c 2
−y 2
is 72 . Answer(s) (separate by commas if necessary): c= You have attempted this problem 0 times. You have unlimited attempts remaining.

Answers

Given that the area of the region bounded by the parabolas x = y² − c² and x = c² − y² is 72 .We need to find all value(s) of c.

Therefore,The region bounded by the parabolas x = y² − c² and

x = c² − y² are shown below:Let's find the points of intersection of the parabolas.

x = y² − c²

x = c² − y²

y² − c² = c² − y²

2c² = 2y²

y² = c²

y = ± c

Now we have four points of intersection of the parabolas.(c, c), (−c, −c), (−c, c), (c, −c)

The area enclosed by the parabolas is given by the product of the horizontal and vertical distances between these points of intersection

.Area of region = 2(√2c)²(√2c - 2c)

Area of region = 4c³ - 8c²= 4c² (c - 2)

We know that the area is 72.

Therefore,4c² (c - 2) = 72

⇒ c² (c - 2) = 18

⇒ c³ - 2c² - 18 = 0

Factorizing the cubic equation,

c³ - 6c² + 4c² - 24 = 0

c² (c - 6) + 4(c - 6) = 0

(c - 6)(c² + 4) = 0

Therefore, the value of c is 6 or c = ± 2i.

As per the given question, the answer is c = 6.

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Which set of statements explains how to plot a point at the location (Negative 3 and one-half, negative 2)?
Start at the origin. Move 3 and one-half units right because the x-coordinate is Negative 3 and one-half. Negative 3 and one-half is between 3 and 4. Move 2 units down because the y-coordinate is -2.
Start at the origin. Move 3 and one-half units down because the x-coordinate is Negative 3 and one-half. Negative 3 and one-half is between -3 and -4. Move 2 units left because the y-coordinate is -2.
Start at the origin. Move 3 and one-half units down because the x-coordinate is Negative 3 and one-half. Negative 3 and one-half is between -3 and -4. Move 2 units right because the y-coordinate is -2.
Start at the origin. Move 3 and one-half units left because the x-coordinate is Negative 3 and one-half. Negative 3 and one-half is between -3 and -4. Move 2 units down because the y-coordinate is -2.

Answers

Answer:

Step-by-step explanation:

The point that you will end up at is **(-0.5, -2)**.

To see this, we start at the origin, which is the point (0, 0). We then move 3.5 units right, which brings us to the point (3.5, 0). Finally, we move 2 units down, which brings us to the point (3.5, -2).

The other points are incorrect because they do not take into account the direction of the movement. For example, the point (-2, -0.5) is incorrect because we move 3.5 units **right**, not left. Similarly, the point (-2, 2) is incorrect because we move 2 units **down**, not up.

Therefore, the only point that you will end up at is (3.5, -2).

En el almacén de una escuela se malograron ocho bolsas de leche de la 25 que había que porcentaje de bolsas de leche se malogró

Answers

The percentage of bags of milk were spoiled is 32%.

What percentage of bags of milk were spoiled?

A percentage is defined as the ratio that can be expressed as a fraction of 100.

We have:

total bags of milk = 25 bags

bags of spoilt milk = 8 bags

percentage of bags of milk were spoiled = 8/25 * 100

percentage of bags of milk were spoiled = 32%

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Question in English

In a school warehouse, eight bags of milk of the 25 that there were, what percentage of bags of milk were spoiled?

10 niños comen 90 dulces en 6 horas. ¿Cuántas horas tardan 8 niños en comer 60 dulces?

4 horas
5 horas
2 horas
3 horas

Answers

The answer to the question is 3 hours. Eight children would take three hours to consume 60 candies, according to the calculations.

This implies that each child eats 90/10=9 candies in 6 hours. Thus, every kid eats 9/6 = 1.5 candies every hour.
We need to know how long it takes for 8 kids to eat 60 candies.

Let's start with the basics. Each kid would have to eat 60/8 = 7.5 candies if 8 kids consumed 60 candies. In other words, each kid eats 7.5 candies. To figure out how long it will take each kid to consume 7.5 candies, we'll use the previous calculation.

If each kid eats 1.5 candies per hour, it would take 7.5/1.5 = 5 hours for one kid to eat 7.5 candies. Since 8 children are consuming it, the time should be divided by 8. As a result, the solution is 5/8 = 0.625 hours. Let's convert it to minutes. 0.625 hours * 60 = 37.5 minutes.

Therefore, it would take 37.5 minutes for 8 kids to consume 7.5 candies. Finally, 60 candies would take 5 times 37.5 minutes, which is 187.5 minutes. As a result, the time it takes 8 children to consume 60 candies is 187.5 minutes, which is 3 hours.

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Find the 2nd solution using reduction of order. x²y"-7xy + 16y=0

Answers

The differential equation given is x²y"-7xy + 16y=0. To find the 2nd solution using reduction of order, we assume that the second solution is of the form y₂ = v(x) y₁(x), where y₁(x) is the known solution and v(x) is an unknown function of x.

Substitute the value of y₂ into the differential equation and simplify it. Then, use the product rule to differentiate y₂ to get the second derivative of y₂. Substitute y₂ and its second derivative into the differential equation and simplify it. Collect the terms with v' and v, and integrate both sides with respect to x to obtain v(x). Substitute the value of v(x) into the second solution, y₂ = v(x) y₁(x) to get the final answer.

Let's consider the given differential equation:

x²y"-7xy + 16y=0.

For the given differential equation, the first solution is assumed to be of the form:y₁ = x⁴We assume that the second solution is of the form:y₂ = v(x) y₁(x) = v(x) x⁴where v(x) is an unknown function of x.

Substituting the value of y₂ in the differential equation:x²y"-7xy + 16y=0x²(y₁v")" - 7x(y₁v') + 16y₁v = 0x²(4(4-1)x²v + 4xv') - 7x(4x³v) + 16x⁴v = 0Simplify it.16x⁴v + 4x³v' - 12x³v' + 16x²v" = 0.

Simplify it.16x²v" + 4x³v'/x² + 4x³v/x⁴ = 0Divide by x⁴.16v" + 4v'/x - 3v'/x + 4v/x² = 0

Collect the terms with v' and v together.4v'/x - 3v'/x + 4v/x² = -16v"Common factor v'/x.4(1 - 3/x) v'/x + 4v/x² = -16v"Integrating both sides with respect to x.4 ∫(1 - 3/x) dx/x + 4 ∫1/x² dx = -16 ∫v" dvC₁ - 4/x + 4/x² = -8v + C₂where C₁ and C₂ are constants of integration and ∫v" dv = v' + C.

So, we can write it as:v' + C = -1/2 (C₁ - 4/x + 4/x²) x⁴ + C₂/x⁴This is the value of v(x).Substituting the value of v(x) in the second solution,y₂ = v(x) y₁(x) = x⁴ (-1/2 (C₁ - 4/x + 4/x²) x⁴ + C₂/x⁴)= -1/2 (C₁x⁸ - 4x⁷ + 4x⁶) + C₂.

The second solution is given byy₂ = -1/2 (C₁x⁸ - 4x⁷ + 4x⁶) + C₂.

Hence, the 2nd solution using reduction of order for the differential equation x²y"-7xy + 16y=0 is given by y₂ = -1/2 (C₁x⁸ - 4x⁷ + 4x⁶) + C₂.

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consider the following vector function
r(t)+ (6 sin(t),t,6 cos(t)
A) find the unit tangent and unit normal vectors T(t) and N(t)
b) Use the formula K(t)=|T'(t)| / |r'(t)| to find the curvature.
k(t)=

Answers

a) the unit normal vector is:

N(t) = (-6 sin(t), 0, -6 cos(t)) / 6

    = (-sin(t), 0, -cos(t))

a) To find the unit tangent vector, T(t), we need to calculate the derivative of the vector function r(t) and then normalize it.

Given:

r(t) = (6 sin(t), t, 6 cos(t))

Taking the derivative of r(t):

r'(t) = (6 cos(t), 1, -6 sin(t))

Now, let's normalize the derivative vector to find the unit tangent vector, T(t):

T(t) = r'(t) / |r'(t)|

|r'(t)| = √([tex](6 cos(t))^2 + 1^2 + (-6 sin(t))^2[/tex])

       = √[tex](36 cos^2(t) + 1 + 36 sin^2(t)[/tex])

       = √[tex](36(cos^2(t) + sin^2(t))[/tex] + 1)

       = √(36 + 1)

       = √37

Therefore, the unit tangent vector is:

T(t) = (6 cos(t), 1, -6 sin(t)) / √37

To find the unit normal vector, N(t), we take the derivative of T(t) and normalize it:

N(t) = T'(t) / |T'(t)|

T'(t) = (-6 sin(t), 0, -6 cos(t))

|T'(t)| = √([tex](-6 sin(t))^2 + 0^2 + (-6 cos(t))^2[/tex])

       = √([tex]36 sin^2(t) + 36 cos^2(t))[/tex]

       = √36

       = 6

b) To find the curvature, K(t), we can use the formula:

K(t) = |T'(t)| / |r'(t)|

|r'(t)| = √37 (from the previous calculation)

|T'(t)| = √([tex](-6 sin(t))^2 + 0^2 + (-6 cos(t))^2[/tex])

       = √([tex]36 sin^2(t) + 36 cos^2(t[/tex]))

       = √36

       = 6

Therefore, the curvature is:

K(t) = |T'(t)| / |r'(t)|

    = 6 / √37

Hence, the curvature is K(t) = 6 / √37.

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The possible outcomes in 2 tosses of a fair coin are TT, TH, HT, and HH. What is the probability of getting exactly 2 heads? 1/4 2/4 1/3 1/5 Question 2 ( 1 point) Suppose that you knew the correlation between two events, A and B, was −0.50. If this correlation accurately describes the relation between A and B, if you increased A, you would, on average, expect B to Increase Decrease Stay the Same All of the Above

Answers

The probability of getting exactly 2 heads in 2 tosses of a fair coin can be calculated by considering the total number of possible outcomes and the number of outcomes that result in exactly 2 heads. The correct answer is "Decrease."

In 2 tosses of a coin, there are 2 possible outcomes for each toss (either a head or a tail). Since each toss is independent, the total number of possible outcomes in 2 tosses is 2 * 2 = 4.

Out of these 4 possible outcomes (TT, TH, HT, HH), only 1 outcome results in exactly 2 heads (HH).

Therefore, the probability of getting exactly 2 heads is 1 out of 4 possible outcomes, which can be written as 1/4.

So, the answer is 1/4.

Regarding question 2, if the correlation between two events A and B is -0.50, it means that there is a negative relationship between A and B. In this case, if you increase A, on average, you would expect B to decrease. Therefore, the correct answer is "Decrease."

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The base of a three-sided prism is an isosceles triangle with a base of length 80 cm and a side of length 41 cm. Calculate the area of ​​the prism if the length of the height of the prism is equal to the length of the height of the lenght of base.

Is my anwer correct? ​

Answers

Step-by-step explanation:

I think the problem definition degraded a bit, when you transferred it over to here.

so, let me try to rephrase this properly, and I hope that my interpretation fits the original problem.

the base of a 3-sided prism is an isoceles triangle with a baseline length of 80 cm, and a side length of 41 cm.

calculate the surface area of the prism, if the length of the height of the prism is equal to the height of the base triangle to its baseline.

let's go through this step by step (even the ones you skipped) :

first : isoceles means that both legs are equally long. so, the prism base is a 80 - 41 - 41 triangle.

the height to its baseline is therefore splitting the baseline in the middle (into 2 equal parts) : 2×40 cm.

therefore it is also splitting the whole main triangle into 2 equal right-angled triangles (half of the baseline, a leg of the main triangle, and the height of the main triangle to the baseline).

now that we have right-angled triangles, we can use Pythagoras to calculate the height, as the leg of the main triangle is now the baseline of the "half" right-angled triangle :

41² = 40² + height²

1681 = 1600 + height²

81 = height²

height = 9 cm

so, the height to the baseline of the main triangle is 9 cm, and so is per definition the height of the prism.

that means, no, you were not correct. I honestly don't know what you did there at the beginning with the height calculation.

but let's continue.

so, the base and the top of the prism are such equal isoceles triangles.

the sides of the prism are (3) rectangles :

one is 80×9 cm²

and the other two are 41×9 cm² each

the area of a triangle is

baseline × height / 2

in our case

80 × 9 / 2 = 40 × 9 = 360 cm²

we have 2 such triangles (base and top) :

2 × 360 = 720 cm²

the areas of the rectangles are

80 × 9 = 720 cm²

41 × 9 × 2 = 738 cm²

so, the total surface area of the prism is

720 + 720 + 738 = 2178 cm²

FYI

if you were looking for the volume of the prism, that would be

base area × prism height = 360 × 9 = 3240 cm³

Question 5: Show that the following IVP has a unique solution in some interval using the existence and uniqueness theorem for nonlinear equations: dy dx 2(y - 1) Question 6: 3x² + 4x + 2 = Question 7

Answers

The differential equation satisfies the Lipschitz condition with respect to y, and according to the existence and uniqueness theorem for nonlinear equations, the IVP dy/dx = 2(y - 1) has a unique solution in some interval.

Question 5: Show that the following IVP has a unique solution in some interval using the existence and uniqueness theorem for nonlinear equations:

**The initial value problem (IVP) dy/dx = 2(y - 1)**

The existence and uniqueness theorem for nonlinear equations states that if a differential equation is continuous and satisfies Lipschitz condition with respect to its dependent variable, then the IVP has a unique solution in some interval.

In this case, the given differential equation dy/dx = 2(y - 1) is continuous for all values of x and y. We need to verify if it satisfies the Lipschitz condition.

To determine the Lipschitz condition, we examine the partial derivative of the right-hand side of the equation with respect to y. Taking the derivative of 2(y - 1) with respect to y gives us 2. Since 2 is a constant, it is bounded on any finite interval.

Therefore, the given differential equation satisfies the Lipschitz condition with respect to y, and according to the existence and uniqueness theorem for nonlinear equations, the IVP dy/dx = 2(y - 1) has a unique solution in some interval.

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The Sieve of Eratosthenes is a well-known way to find prime numbers. 6.1 You are just about to teach the prime numbers to the grade four class. Explain the strategy you will use to ensure that your learners understand and know the prime numbers between 1 and 100. Use your own words and clear procedure should be explained in full.

Answers

The strategy I will use to ensure that my learners understand and know the prime numbers between 1 and 100 is to use visual aids and interactive activities to help them identify patterns and memorize the prime numbers.

To teach the prime numbers to the grade four class and ensure that they understand and know the prime numbers between 1 and 100, I will use a variety of teaching strategies to help them identify patterns and memorize the prime numbers. The following are the strategies I will use:

Visual Aids: I will use visual aids such as charts and diagrams to help students understand the concept of prime numbers. This will help them visualize and understand the patterns that exist in prime numbers and how they differ from composite numbers.

Interactive Activities: I will use interactive activities such as games and quizzes to engage students and make learning fun. This will help them remember the prime numbers and also help them identify patterns in prime numbers.

Repetition: I will repeat the lesson several times to ensure that students have a solid understanding of the concept. This will help them remember the prime numbers and the patterns that exist in them.

In conclusion, teaching the prime numbers to the grade four class can be made fun and engaging by using a variety of teaching strategies such as visual aids, interactive activities, and repetition. These strategies will help students identify patterns and memorize the prime numbers, ensuring that they have a solid understanding of the concept.

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Find The Volume Of The Solid Bounded Above By The Graph Of F(X,Y)=Xysin(X2y) And Below By The Xy-Plane On The Rectangular

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To find the volume of the solid bounded above by the graph of f(x, y) = xysin(x^2y) and below by the xy-plane on the rectangular region R, we need to integrate the function over the given region.

Let's assume the rectangular region R is defined by the intervals a ≤ x ≤ b and c ≤ y ≤ d.

The volume V of the solid can be calculated using a double integral:

V = ∬R f(x, y) dA

Where dA represents the differential area element.

To evaluate this integral, we need to express f(x, y) in terms of x and y and define the limits of integration based on the given rectangular region.

f(x, y) = xysin(x^2y)

Now, we can set up the double integral:

V = ∫∫R xysin(x^2y) dA

Integrating with respect to x first, we have:

V = ∫(from a to b) ∫(from c to d) xysin(x^2y) dy dx

Integrating with respect to y, we get:

V = ∫(from a to b) [-cos(x^2y)] (from c to d) dx

Now, we can evaluate the integral using the given limits of integration. The specific values of a, b, c, and d determine the size and shape of the rectangular region R.

By calculating this double integral with the appropriate limits of integration, we can find the volume of the solid bounded above by the graph of f(x, y) = xysin(x^2y) and below by the xy-plane on the rectangular region R.

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Nine $1000, 8% bonds with interest payable semi-annually and redeemable at par are purchased ten years before maturity. Calcula the purchase price if the bonds are bought to yield (a) 6%; (b) 8%; (c) 10% (a) The premium/discount is $85.84, and the purchase price is $ (Round the final answers to the nearest cent as needed. Round all intermediate values to six decimal places as needed.)

Answers

Therefore, the purchase price of the bonds for yields of 6%, 8%, and 10% are approximately $1,126.69, $1,000, and $883.16, respectively.

To calculate the purchase price of the bonds, we need to use the present value formula for a bond.

The present value (PV) of a bond is given by the formula:

[tex]PV = C * (1 - (1 + r)^(-n)) / r + M / (1 + r)^n[/tex]

Where:

PV = Present value (purchase price)

C = Periodic coupon payment (in this case, $80, calculated as 8% of $1000)

r = Periodic interest rate (semi-annual yield divided by 2)

n = Number of periods (number of years before maturity multiplied by 2, since interest is payable semi-annually)

M = Maturity value (par value of the bond, $1000)

(a) For a yield of 6%:

r = 6% / 2 = 0.03

n = 10 * 2 = 20

Using the formula, we have:

[tex]PV = 80 * (1 - (1 + 0.03)^(-20)) / 0.03 + 1000 / (1 + 0.03)^20[/tex]

Calculating the value, we find that the purchase price is approximately $1,126.69.

(b) For a yield of 8%:

r = 8% / 2

= 0.04

n = 10 * 2

= 20

Using the formula, we have:

[tex]PV = 80 * (1 - (1 + 0.04)^(-20)) / 0.04 + 1000 / (1 + 0.04)^20[/tex]

Calculating the value, we find that the purchase price is approximately $1,000 (since the yield is the same as the coupon rate, there is no premium or discount).

(c) For a yield of 10%:

r = 10% / 2 = 0.05

n = 10 * 2 = 20

Using the formula, we have:

[tex]PV = 80 * (1 - (1 + 0.05)^(-20)) / 0.05 + 1000 / (1 + 0.05)^20[/tex]

Calculating the value, we find that the purchase price is approximately $883.16.

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Given \( u= \) and \( v= \), find the following. Leave answers in i,j form. a) \( 2 v \) b) \( 2 u+v \) c) \( 3 u-5 v \)

Answers

On perform simple arithmetic operations we get

a) [tex]\(2v = 2i - 4j\)[/tex]

b) [tex]\(2u+v = 3i - 2j\)[/tex]

c) [tex]\(3u-5v = 7i + 2j\)[/tex]

To find the values of the given expressions, we need to perform simple arithmetic operations on the given vectors [tex]\(u\) and \(v\).[/tex]

a) For  [tex]\(2v\)[/tex], we multiply each component of [tex]\(v\)[/tex] by 2. Since [tex]\(v\)[/tex] is not explicitly defined in the question, we cannot provide the exact values. However, assuming [tex]\(v = i - 2j\)[/tex], multiplying each component by 2 gives us [tex]\(2v = 2i - 4j\)[/tex].

b) For [tex]\(2u + v\)[/tex], we multiply each component of  by [tex]\(u\)[/tex]2, and then add the corresponding components of [tex]\(v\)[/tex]. Again, without the exact values of \(u\) and [tex]\(v\)[/tex] we cannot provide the precise result. Assuming [tex]\(u = 3i + 4j\)[/tex] and[tex]\(v = i - 2j\)[/tex], the calculation would be [tex]\(2u + v = (2 \cdot 3i) + (2 \cdot 4j) + (1 \cdot i) + (1 \cdot -2j) = 3i - 2j\).[/tex]

c) For [tex]\(3u - 5v\)[/tex], we multiply each component of [tex]\(u\)[/tex]by 3, multiply each component of [tex]\(v\)[/tex] by 5, and then subtract the corresponding components. Once again, without the exact values of [tex]\(u\)[/tex] and [tex]\(v\)[/tex], we cannot provide the precise result. Assuming [tex]\(u = 3i + 4j\) and \(v = i - 2j\)[/tex], the calculation would be [tex]\(3u - 5v = (3 \cdot 3i) + (3 \cdot 4j) - (5 \cdot i) - (5 \cdot -2j) = 7i + 2j\)[/tex].

Since question is incomplete, the complete statement is shown below:

"Given [tex]\( u= \)[/tex] and [tex]\( v= \)[/tex] , find the following.

Leave answers in i,j form.

a) [tex]\( 2 v \)[/tex]

b) [tex]\( 2 u+v \)[/tex]

c) [tex]\( 3 u-5 v \)[/tex]"

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Using the Empirical Rule, in a normal distribution what percentage of values would fall into an interval of 91.8 to 178.2 where the mean is 135 and standard deviation is 43.2? Please format to 3 decimal places

Answers

Using Empirical Rule we obtain that approximately 68% of the values would fall into the interval from 91.8 to 178.2 in a normal distribution with a mean of 135 and a standard deviation of 43.2.

The Empirical Rule states that for a normal distribution:

- Approximately 68% of the values fall within one standard deviation of the mean.

- Approximately 95% of the values fall within two standard deviations of the mean.

- Approximately 99.7% of the values fall within three standard deviations of the mean.

In this case, the interval is 91.8 to 178.2, with a mean of 135 and a standard deviation of 43.2.

To determine the percentage of values within this interval, we can calculate the z-scores corresponding to the lower and upper bounds of the interval, and then use the Empirical Rule to estimate the percentage.

The z-score is calculated as:

z = (x - μ) / σ

where x is the value, μ is the mean, and σ is the standard deviation.

For the lower bound (91.8):

z1 = (91.8 - 135) / 43.2 ≈ -0.993

For the upper bound (178.2):

z2 = (178.2 - 135) / 43.2 ≈ 1.000

According to the Empirical Rule, approximately 68% of the values fall within one standard deviation of the mean, which corresponds to z-scores between -1 and 1.

Therefore, the percentage of values in the interval from 91.8 to 178.2 is approximately:

Percentage = (68% / 2) + (68% / 2) ≈ 34% + 34% = 68%

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Explain how a sampling distribution can be conformed to from a
finite population.

Answers

In order to understand how a sampling distribution can be conformed to from a finite population, we must first define what a sampling distribution is. A sampling distribution is a probability distribution of a statistic obtained from a larger number of samples drawn from a specific population. It can be used to estimate the parameters of the population.

The idea is to randomly draw samples from the population, calculate the sample statistic and repeat this process several times. As more and more samples are drawn, the sampling distribution approaches a normal distribution. Now, let us see how this can be conformed to from a finite population.

Step 1: Define the parameter that we want to estimate.

This could be the mean, standard deviation or any other parameter of interest.

Step 2: Define the sample size that we want to use. This is the number of elements that we want to sample from the population.

Step 3: Randomly select a sample of size n from the population.

Step 4: Calculate the statistic of interest for this sample. This could be the sample mean, sample standard deviation or any other statistic that we want to estimate.

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Let g(x)=11x+6cos(x)−6tan(x). Find: dxdg​sinx​=?

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The required value of [tex]dxdg​sinx= cos(x) × (11 - 6sin(sin(x)) - 6 / cos²(sin(x))) ÷ (11 - 6sin(sin(x)) - 6sec²(sin(x)))[/tex]is given by the above.

Given function: g(x)=11x+6cos(x)−6tan(x)

We are asked to find dxdg​sinx

We can start by using the chain rule:

                             dy/dx=dydu×dudx

Let u = sin(x)So we can say that y = g(u) = 11u + 6cos(u) - 6tan(u)

Then dydu = 11 - 6sin(u) - 6sec²(u).

Using trigonometric identities: sec²(x) = 1 + tan²(x)

Therefore, sec²(u) = 1 + tan²(u) = 1 + sin²(u)cos²(u) / cos²(u) = (1 + sin²(u)) / cos²(u).

Plugging in the value of sin(u) and cos(u) from u = sin(x): sin(u) = sin(sin(x)) cos(u) = cos(sin(x))

Then we have:sec²(u) = (1 + sin²(sin(x))) / cos²(sin(x))

Now, we can substitute back:dydu = 11 - 6sin(sin(x)) - 6(1 + sin²(sin(x))) / cos²(sin(x))

Let's simplify this expression:dydu = 11 - 6sin(sin(x)) - 6cos²(sin(x)) / cos²(sin(x)) - 6sin²(sin(x)) / cos²(sin(x))dydu = 11 - 6sin(sin(x)) - 6 / cos²(sin(x))

Therefore, dxdg​sinx = dxdu × dydx÷dydu

Now we just need to plug in the derivatives: dxdu = cos(x)dydx

                          = 11 - 6sin(sin(x)) - 6 / cos²(sin(x))dydu

                           = 11 - 6sin(u) - 6sec²(u)dydu

                             = 11 - 6sin(sin(x)) - 6 / cos²(sin(x))

Therefore: dxdg​sinx = dxdu × dydx÷dydu= cos(x) × (11 - 6sin(sin(x)) - 6 / cos²(sin(x))) ÷ (11 - 6sin(sin(x)) - 6sec²(sin(x)))

Hence, the required value of dxdg​sinx= cos(x) × (11 - 6sin(sin(x)) - 6 / cos²(sin(x))) ÷ (11 - 6sin(sin(x)) - 6sec²(sin(x))) is given by the above.

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Solve the initial-value problem 2y" + 5y - 3y = 0, y(0) = -1, y/(0) = 24. Answer: y(x) = | Preview My Answers Submit Answers

Answers

The particular solution to the initial-value problem 2y" + 5y - 3y = 0, y(0) = -1, y/(0) = 24 is:

y(x) = -cos(x) + 24sin(x)

To solve the given initial-value problem, we can assume the solution has the form y(x) = e^(rx), where r is a constant.

Taking the derivatives, we have:

y'(x) = re^(rx)

y''(x) = r^2e^(rx)

Substituting these derivatives into the differential equation, we get:

2(r^2e^(rx)) + 5(e^(rx)) - 3(e^(rx)) = 0

Factoring out e^(rx), we have:

e^(rx)(2r^2 + 5 - 3) = 0

This gives us the quadratic equation:

2r^2 + 2 = 0

Solving this equation, we find two possible values for r:

r1 = -sqrt(2)i

r2 = sqrt(2)i

Since the roots are imaginary, the general solution is given by:

y(x) = c1e^(0)x cos(sqrt(2)x) + c2e^(0)x sin(sqrt(2)x)

Applying the initial conditions:

y(0) = -1:

c1 = -1

y'(0) = 24:

y'(x) = e^(0)x (c1cos(sqrt(2)x) - sqrt(2)c1sin(sqrt(2)x)) + e^(0)x (c2sin(sqrt(2)x) + sqrt(2)c2cos(sqrt(2)x))

24 = (c1 - sqrt(2)c1) + sqrt(2)c2

24 = (1 - sqrt(2))c1 + sqrt(2)c2

Solving these equations simultaneously, we can find the values of c1 and c2.

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Find the unit vector that has the same direction as the vector \( \mathrm{v} \). \[ v=-5 i+12 j \] Find the exact value by using a difference identity. \[ \tan 285^{\circ} \]

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The exact value of tan(285°) is (sqrt(3) - 2) / 2. To find the unit vector that has the same direction as the vector v = -5i + 12j, we first need to find the magnitude of v using the Pythagorean theorem.

|v| = sqrt((-5)^2 + 12^2) = 13

Now, we can use the formula for a unit vector:

u = v / |v|

Substituting v and |v|, we get:

u = (-5/13)i + (12/13)j

This is the unit vector that has the same direction as v.

Next, we can use the difference identity for tangent:

tan(285°) = tan(225° + 60°)

= (tan(225°) + tan(60°)) / (1 - tan(225°)tan(60°))

= (-1 + sqrt(3)) / (1 + sqrt(3))

Multiplying numerator and denominator by (1 - sqrt(3)), we get:

tan(285°) = [(-1 + sqrt(3))(1 - sqrt(3))] / [(1 + sqrt(3))(1 - sqrt(3))]

= (2 - sqrt(3)) / (-2)

= (sqrt(3) - 2) / 2

Therefore, the exact value of tan(285°) is (sqrt(3) - 2) / 2.

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Calculate the period T and celerity c of a wave of wavelength L = 80 m travelling in water depth d = 55 m. the wave frequency f = 0.23.

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The period (T) of the wave is approximately 4.35 seconds, and the celerity (c) of the wave is approximately 23.24 m/s.

To calculate the period (T) and celerity (c) of a wave in water, we can use the following formulas:

Period (T) = 1 / frequency (f)

Celerity (c) = √(gravity (g) * water depth (d))

Given:

Wavelength (L) = 80 m

Water depth (d) = 55 m

Wave frequency (f) = 0.23

First, we can calculate the period (T) using the wave frequency:

T = 1 / f

T = 1 / 0.23

T ≈ 4.35 seconds

Next, we can calculate the celerity (c) using the water depth and gravity:

Acceleration due to gravity (g) ≈ 9.81 m/s²

c = √(g * d)

c = √(9.81 m/s² * 55 m)

c ≈ √(539.55 m²/s²)

c ≈ 23.24 m/s

Therefore, the period (T) of the wave is approximately 4.35 seconds, and the celerity (c) of the wave is approximately 23.24 m/s.

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Consider an agricultural capsule aimed at insect control by the release of a specific pheromone (our species A ). The amount of the pheromone released is mostly controlled by a polymeric membrane whose thickness is δ=4.5 mm and whose diameter is d=15.2 mm. The diffusion coefficient D A
P

for this pheromone through the polymeric membrane is 0.37μm 2
/s. The release of this pheromone is sustained by its own sublimination in the gaseous chamber of the capsule, whose rate W A

is given by this expression: W A

=2.4⋅10 −17
(1−14C A
G

) Here, C A
G

is the concentration of the pheromone throughout the gaseous chamber, and specifically at the interface, it is related with the concentration of the pheromone in the polymeric membrane C A
P

by this expression: The solubility ratio in this case is S=5.22⋅10 −3
. This is all for the inside of the capsule. The solubility ratio in this case is S=5.22⋅10 −3
. This is all for the inside of the capsule. that C A
P

is a variable, while C A
G

is a constant, and they are both given in units of mol/m 3
(the rate is in units of mol/s). a. Determine the profiles for the concentration and the flux of the pheromone through the polymeric membrane. Apply the boundary conditions, but do not yet plug in any specific numbers for the parameters. b. Plug in the specific numbers provided for this scenario. Importantly, determine the concentration of the pheromone throughout the gaseous chamber, as well as the rate of its sublimination.

Answers

To determine the concentration and flux profiles of the pheromone through the polymeric membrane, Fick's second and first laws of diffusion are used, respectively, with appropriate boundary conditions. By plugging in the given values and solving the diffusion equation, the concentration profile inside the membrane and the rate of sublimation of the pheromone can be calculated.

a) To determine the profiles for the concentration and flux of the pheromone through the polymeric membrane, we need to solve the diffusion equation with appropriate boundary conditions. The concentration profile can be obtained by solving Fick's second law of diffusion, considering a cylindrical coordinate system. The flux of the pheromone can be calculated using Fick's first law of diffusion. The boundary conditions will depend on the specific setup of the system, such as the initial and boundary concentrations.

b) Plugging in the specific numbers provided for this scenario, we can calculate the concentration of the pheromone throughout the gaseous chamber and the rate of its sublimation. By solving the diffusion equation with the given dimensions of the polymeric membrane (thickness and diameter), the diffusion coefficient, and the solubility ratio, we can determine the concentration profile inside the membrane and the flux of the pheromone. Additionally, using the given expression for the rate of sublimation, which depends on the concentration at the interface between the membrane and the gaseous chamber, we can calculate the rate of release of the pheromone.

It is important to note that the specific calculations will require plugging in the provided values and performing the necessary mathematical operations to obtain the concentration profile, flux, and sublimation rate. These results will provide insights into the behavior of the pheromone release system and can be used for further analysis and optimization of the agricultural capsule.

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A survey line BAC crosses a river, A and C being on the near and distant banks respectively. Standing at D, a point 50 metres measured perpendicularly to AB from A, the bearings of Cand B are 320∘ and 230∘ respectively, AB being 25 metres. Find the width of the river. calculate with a neat sketch and correct answer asap no wrong attempt I'm tired of posting this

Answers

The width of the river is 2AC = [tex]125\sqrt{5ivec2 + 3} = 125(2.717)[/tex] is approximately 339.63 m.

Let P be the point on the bank of the river that is 50 m from A along the perpendicular bisector of AB.

From point P, let the angle APD = α, and the angle APC = β.

Now, by the Law of Cosines, we have:

cosβ=[tex]\frac{AP^{2} + AC^{2} - PD^{2}}{2AP.AC}[/tex]

cosα=[tex]\frac{AP^{2} + AD^{2} - PD^{2}}{2AP.AD}[/tex]

Also, AP = 25 m, AD = 50 m and PC = (AC - AD)

Substituting these values in the above equations of cosβ and cosα, and solving for AC, we find:

AC = √(50² + 25²- 50²cosβcosα)

from which, the width of the river (i.e. 2AC) is equal to

2AC = 2√(50² + 25² - 50²cosβcosα)

Now, from the given bearings of C and B, we have

cosβ = cos320° = -3/2 and cosα = cos230° = (3ivec)/2

Substituting these values in the expression for AC, we have

2AC = [tex]2\sqrt{50^2 + 25^2 +(3^3)/4}[/tex]

2AC = [tex]125\sqrt{2 + \frac{3}{2} } = 125\sqrt{5ivec2 + 3}[/tex]

Hence, the width of the river is 2AC = [tex]125\sqrt{5ivec2 + 3} = 125(2.717)[/tex] is approximately 339.63 m.

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quickly please
a) b) d) Which one of the following materials cannot be polished? Limestone Granite Sandstone Marble

Answers

The material that cannot be polished is sandstone.

Sandstone cannot be polished due to its composition and structure. Unlike limestone, granite, and marble, sandstone is a sedimentary rock made up of sand-sized grains held together by a cementing material. This composition makes sandstone porous and prone to crumbling or breaking during the polishing process.

Polishing involves using abrasives to smooth the surface of a material and create a reflective finish. However, because of its porous nature, sandstone cannot be polished to the same extent as other stones. Polishing can cause the surface of sandstone to become uneven or even damage the stone.

In contrast, materials like limestone, granite, and marble are better suited for polishing. These stones have a denser composition and can be polished to a smooth and glossy finish. They are commonly used in flooring, countertops, and decorative features due to their durability and aesthetic appeal.

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Consider the following function, \[ f^{*}(\theta)=\sin (\theta)+\cos (\theta) \] Find \( f^{\prime} \) if \( f^{\prime}(0)=2 \). Find \( f \) if \( f^{\prime}(0)=2 \) and \( f(0)=1 \). \[ f(\theta)= \

Answers

The function f(θ) is 2sinθ - 2cosθ + 3.

To find f'(θ), we need to take the derivative of the given function f^*(θ)= sinθ+cosθ with respect to θ.

The derivative of sinθ is cosθ, and the derivative of cosθ is -sinθ. Therefore, f'(θ) is given by:

f'(θ) = cosθ - sinθ

Next, we can use the given information to find f(θ) using the derivative f'(θ).

Given that f'(0) = 2, we substitute θ = 0 into the derivative:

f'(0) = cos(0) - sin(0) = 1 - 0 = 1

Since f'(0) = 2, this means that the derivative f'(θ) increases by a factor of 2. Therefore, we can express f'(θ) as:

f'(θ) = 2(cosθ - sinθ)

Now, to find f(θ) given f'(0) = 2 and f(0) = 1, we integrate f'(θ) with respect to θ.

∫f'(θ) dθ = ∫2(cosθ - sinθ) dθ

The integral of cosθ is sinθ, and the integral of -sinθ is -cosθ. Therefore, we have:

f(θ) = 2sinθ + 2(-cosθ) + C

Where C is the constant of integration.

Using the condition f(0) = 1, we can substitute θ = 0 and f(θ) = 1 into the equation to solve for C:

1 = 2sin(0) + 2(-cos(0)) + C

1 = 0 - 2 + C

1 = -2 + C

C = 3

Therefore, the function f(θ) is:

f(θ) = 2sinθ - 2cosθ + 3

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Part B visible light ( 505 nm ) Express your answer using three significant figures. ultraviolet radiation (135 nm ) Express your answer using three significant figures. View Avallable Hint(s) Collin is writing a compare and contrast paragraph about different language courses offered at his school.Point: English is the most common language in the United States, but people also speak French and Spanish.Illustration: More than 37 million people over the age of five speak Spanish in the U.S., and approximately 2 million people speak French.Based on the point and illustration, which is the best explanation or analysis of the evidence? The demand function for a certain item is Q=p5^e^(p+10)Remember elasticity is given by the equation E=dQ/dp p/Q.Find E as a function of p.E= if the continuous random variable is x is normally distributed,with mean and standard deviation . FindP(-2 The box plot shows the times for sprinters on a track team.A horizontal number line starting at 40 with tick marks every one unit up to 59. The values of 41, 43, 49.5, 56, and 58 are all marked by the box plot. The graph is titled Sprinters' Run Times, and the line is labeled Time in Seconds.Which of the following is the five-number summary for this data? Min = 42, Q1 = 44, Median = 50, Q3 = 54, Max = 56 Min = 41, Q1 = 43, Median = 49.5, Q3 = 56, Max = 58 Min = 44, Q1 = 48, Median = 50.5, Q3 = 53, Max = 56 Min = 41, Q1 = 45, Median = 49, Q3 = 56, Max = 58 81. Which of the following is NOT composed of protein? A. sex hormones C. Hair B. Muscle D. Enzymes 5. If you consumed polyglutamate and if you consumed food in excess of your energy needs, you would deposit some of the carbon in this foodstuff as triacylglycerols in your adipose tissue. Outline the metabolic reactions in your small intestine, liver, and adipose tissue that allow for this transfer of dietary polyglutamate to body fat (triacylglycerols). a. (3 pts) Intestinal tract: b. (3 pts) Liver: c. (3 pts) Adipose tissue: the product of 4 and g score is 72 Consider the function f(x) = x - 4x + 2 on the interval [0, 4]. Verify that this function satisfies the three hypotheses of Rolle's Theorem on the inverval. f(x) is 2+sqrt2 f(x) is 2-sqrt2 f(0) = f(4) = 2 on [0,4]; on (0,4); Then by Rolle's theorem, there exists a c such that f'(c) = 0. Find the value c. C = 2 Consider the function f(x) = on the interval [4, 12]. (A) Find the average or mean slope of the function on this interval. Average Slope = -1/48 (B) By the Mean Value Theorem, we know there exists a c in the open interval (4, 12) such that f'(c) is equal to this mean slope. Find all values of that work and list them (separated by commas) in the box below. List of values: 4(sqrt3),-4(sqrt3) HELP PLEASEEEEQ. 19You find a rare comic book at a yard sale and determine that the price of the comic book, y, measured in hundreds of dollars, after x years can be represented by the following graph. Exponential function increasing from the left and passing through the points 0 comma 5 and 4 comma 7 and 321 thousandths Based on the graph, what is the cost of the rare comic book after 5 years?A. $1,000B. $800C. $80D. $10 When you have completed this concept assignment, use synthetic division to see if x = -2 is a zero of f (x) = 3x 4x + 5x + 2 or if x= -2 is a lower bound for the zeros of f(x) or if it is neither of these things, type your answer in the text-box