Answer:
We can use the information that 24 families watched 16 hours or less to estimate the sample size. Since the 7th percentile is 16 hours, we know that 7% of the sample watched 16 hours or less. Therefore, we can set up a proportion:
(24 / x) = 0.07
where x is the total number of families in the sample. Solving for x, we get:
x = 24 / 0.07 ≈ 343
Rounding to the nearest integer, we can estimate that there are approximately 343 families in the sample.
Suppose u and v are functions of x that are differentiable at x=0 and that u(0)=-8, u'(0)=-4, v(0)=9, and v'(0)=5. Find the values of the following derivatives at x=0.
Answer:
(A) -76
(B) 4/81
(C) -1/16
(D) 3
Step-by-step explanation:
It is given that u and v are functions of x and are differentiable at x=0 and that u(0) = -8, u'(0) = -4, v(0) = 9, and v'(0) = 5. We are asked to find the following derivatives at x=0.
(A) - [tex]\dfrac{d}{dx}[uv][/tex]
(B) - [tex]\dfrac{d}{dx}\Big[\dfrac{u}{v} \Big][/tex]
(C) - [tex]\dfrac{d}{dx}\Big[\dfrac{v}{u} \Big][/tex]
(D) - [tex]\dfrac{d}{dx} [-5v-7u][/tex]
[tex]\hrulefill[/tex]
Part (A) - Using the product rule.
[tex]\dfrac{d}{dx}[uv]=uv'+vu'[/tex]
Substituting in our values:
[tex](-8)(5)+(9)(-4)\\\\\\\therefore \boxed{=-76}[/tex]
Part (B) - Using the quotient rule.
[tex]\dfrac{d}{dx}\Big[\dfrac{u}{v} \Big]=\dfrac{vu'-uv'}{v^2}[/tex]
Evaluating at x=0:
[tex]\dfrac{(9)(-4)-(-8)(5)}{(9)^2}\\\\\\\therefore \boxed{=\frac{4}{81} }[/tex]
Part (C) - Using the quotient rule.
[tex]\dfrac{d}{dx}\Big[\dfrac{v}{u} \Big]=\dfrac{uv'-vu'}{u^2}[/tex]
Evaluating at x=0:
[tex]\dfrac{(-8)(5)-(9)(-4)}{(-8)^2}\\\\\\\therefore \boxed{=\frac{-1}{16} }[/tex]
Part (D) - Deriving the function.
[tex]\dfrac{d}{dx} [-5v-7u]=-5v'-7u'[/tex]
Substituting in our values:
[tex]-5(5)-7(-4)\\\\\\\therefore \boxed{=3}[/tex]
Thus, all parts have been solved.
Planes A and B intersect.
n
m
W
k
1
Y
V
B
Z
P
ix
A
The point of intersection of line m and line n is: Line W
What is the point of intersection of the Lines?The intersection of two lines is defined as the point where the two lines intersect or intersects.
Line segments m and n are assumed to intersect. That is, they must eventually intersect.
In this question we need to find the intersection of lines l and m.
And suppose lines A and B intersect.
From the given figure, we can see that in plane A, lines m and n intersect at point W. The point W is therefore the intersection of the two lines m and n.
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What is the value of [-12]?
–13
–12
12
13
The calculated value of [-12] is (b) -12
How to determine the value of [-12]?From the question, we have the following parameters that can be used in our computation:
[-12]
Remove the square bracket
So, we have
-12
The above expression cannot be further simplified
So, we have
[-12] = -12
Hence, the calculated value of [-12] is (b) -12
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Answer:
-12
Step-by-step explanation:
took the quiz
please answer this question below correctly
Answer:
a) sum
b) shorter
c) longest
Step-by-step explanation:
a) sum
b) shorter
c) longest
A pharmaceutical company claims that a drug cures a rare skin disease 75% of the time. The claim is checked by testing the drug on 200 patients. If at least 140 patients are cured, then this claim will be accepted. Use this information to answer the following two questions. 1)Find the probability that the claim will be rejected, assuming that the manufacturer's claim is true. 2.) Find the probability that the claim will be accepted, assuming that the actual probability that the drug cures the skin disease is 65%.
Answer:
probability that the claim will be accepted, assuming the actual probability of cure is 65%, is approximately 0.9631 or 96.31%.
Step-by-step explanation:
Apologies for the confusion earlier. Let's calculate the probabilities based on the given information:
1) Find the probability that the claim will be rejected, assuming that the manufacturer's claim is true:
Using the normal approximation, we can find the z-score corresponding to X = 139. We standardize the random variable as follows:
Z = (X - μ) / σ
Z = (139 - 150) / sqrt(37.5) ≈ -1.795
Now we can find the probability using the standard normal table or a calculator:
P(Z < -1.795) ≈ 0.0369
Therefore, the probability that the claim will be rejected, assuming the manufacturer's claim is true, is approximately 0.0369 or 3.69%.
2) Find the probability that the claim will be accepted, assuming that the actual probability that the drug cures the skin disease is 65%:
Using the normal approximation, we can find the z-score corresponding to X = 139:
Z = (139 - 150) / sqrt(37.5) ≈ -1.795
Now we can find the probability:
P(Z > -1.795) ≈ 1 - P(Z < -1.795) ≈ 1 - 0.0369 ≈ 0.9631
Therefore, the probability that the claim will be accepted, assuming the actual probability of cure is 65%, is approximately 0.9631 or 96.31%.
chatgpt
Find the measure of the missing angles.
24°
122°
d
e
f
Therefore, the missing angle = (1080° - 947°) = 133°
Step-by-step explanation:
Given: Octagon
7 Interior Angles: 122°, 143°, 152°, 107°, 128°, 130° & 165°
Find: The measure of the missing angle:
Plan: Determine total sum of an octagons interior angles and subtract the total of the given angles
Sum of the Interior Angles of an Octagon:S = (n-2) 180°
S = (8 - 2)180° = 6 x 180° = 1080°
Sum of 7 Given Angles: S7IA = 947°
Kevin tiene 2 veces la edad de Gabriela. Hace 12 años Kevin tenía 6
veces la edad de Gabriela.
¿Cuántos años tiene Kevin actualmente?
Answer:
30
Step-by-step explanation:
ahora:
edad de Kevin = k
edad de Gabriela = g
k = 2g
hace 12 años:
edad de kevin = k - 12
edad de gabriela = g - 12
k - 12 = 6(g - 12)
k = 2g
k - 12 = 6(g - 12)
2g - 12 = 6(g - 12)
2g - 12 = 6g - 72
4g = 60
g = 15
k = 2g = 2 × 15 = 30
When building a house, the number of days required to build is inversely proportional to the number of workers. One house was built in 161 days by 4 workers. How many days would it take to build a similar house with 46 workers?
It will take 14 days for 46 workers to build similar house.
How to find the number of days to build similar house?When building a house, the number of days required to build is inversely proportional to the number of workers.
Therefore,
d α 1 / w
d = k / w
k = dw
where
k = constant of proportionalityd = number of daysw = number of workersTherefore,
k = 161 × 4
k = 644
Let's find the number of days to build similar house with 46 workers.
Therefore,
d = 644 / 46
d = 14 days
Therefore, it will take 14 days.
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A company claims that its heaters last less than 5 years. Write the null and alternative hypotheses.
The goal would be to gather sufficient evidence to either reject the null hypothesis in favor of the alternative hypothesis or fail to reject the null hypothesis.
The null hypothesis (H₀): The company's heaters have a mean lifespan of 5 years or more.
The alternative hypothesis (H₁): The company's heaters have a mean lifespan of less than 5 years.
In hypothesis testing, the null hypothesis represents the claim or assumption that is being tested. In this case, the null hypothesis assumes that the mean lifespan of the company's heaters is equal to or greater than 5 years. The alternative hypothesis, on the other hand, challenges this claim and suggests that the mean lifespan is less than 5 years.
To determine which hypothesis is supported by the evidence, statistical analysis would need to be conducted using appropriate data and methods. The goal would be to gather sufficient evidence to either reject the null hypothesis in favor of the alternative hypothesis or fail to reject the null hypothesis.
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What is the effect on the graph of f(x) = x² when it is transformed to
h(x) = 3x²-7?
A. The graph of f(x) is horizontally compressed by a factor of 3 and
shifted 7 units to the right.
B. The graph of f(x) is vertically stretched by a factor of 3 and shifted
7 units down.
C. The graph of f(x) is vertically stretched by a factor of 3 and shifted
7 units to the right.
D. The graph of f(x) is horizontally stretched by a factor of 3 and
shifted 7 units down.
The effect on the graph of f(x) = x² when it is transformed to h(x) = 3x² - 7 is described by option B. The graph of f(x) is vertically stretched by a factor of 3 and shifted 7 units down.
The original function f(x) = x² represents a parabola with its vertex at the origin (0, 0). The graph opens upward and has a general U-shape.The transformation h(x) = 3x² - 7 indicates that the function has been multiplied by 3, resulting in a vertical stretch. This means that the points on the graph are now vertically spread out, making the U-shape more elongated.Additionally, the transformation includes subtracting 7 from the function, shifting the entire graph downward by 7 units. This means that each y-coordinate of the original function has been reduced by 7 units.The combination of the vertical stretch by a factor of 3 and the downward shift of 7 units results in a new graph h(x) that is vertically stretched and shifted downward. The overall shape of the graph remains a U-shaped parabola, but it is now wider and lower compared to the original graph.Therefore, option B accurately describes the effect of the transformation on the graph of f(x) = x² to h(x) = 3x² - 7.For more such questions on graph, click on:
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1000
Store Sales
Store A sells five times as many products as Store B and one third as many as Store C. If Store C sells 145,670
products, how many products does Store B sell?
9,711
48,557
87,402
242,783
728,350
Q Search
O
H
D
Submit
If Store C sells 145,670 products then Store B sells 9,711 products. Option A is the correct answer.
To determine the number of products Store B sells, we need to calculate it based on the information given in relation to Store C.
Given that Store C sells 145,670 products, and Store A sells one-third as many as Store C, we can find the number of products Store A sells:
Store A = (1/3) * Store C = (1/3) * 145,670 = 48,557
Now that we know Store A sells 48,557 products, and it sells five times as many products as Store B, we can calculate the number of products Store B sells:
Store B = (1/5) * Store A = (1/5) * 48,557 = 9,711
Therefore, Store B sells 9,711 products. Option A is the correct answer.
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x/x-3+1/3=1 what values should be excluded
The value x = 3 should be excluded from the solution set because it would result in a division by zero in the equation.
How to determine the values that should be excludedTo determine the values that should be excluded in the equation x/(x - 3) + 1/3 = 1, we need to find the values of x that would make the equation undefined or result in a division by zero.
In this case, the expression x - 3 appears in the denominator, so we need to find the values of x that would make x - 3 equal to zero.
x - 3 = 0
x = 3
Therefore, the value x = 3 should be excluded from the solution set because it would result in a division by zero in the equation.
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the sum of 5 and the square of a number
The value of the sum of 5 and the square of a number varies depending on the value of n. When n = 1, the result of the expression is 6, when n = 2, the result is 9, and when n = 3, the result is 14. The same applies when n is negative.
The sum of 5 and the square of a number is an expression that can be represented as (n² + 5), where n represents the number whose square is added to 5. The result of the expression varies depending on the value of n. In this answer, we will examine how to find the sum of 5 and the square of a number using various values of n.
If n = 1, then the square of n is equal to 1, and the sum of 5 and the square of n is equal to 6. Therefore, if n = 1, the result of the expression is 6.
If n = 2, then the square of n is equal to 4, and the sum of 5 and the square of n is equal to 9. Therefore, if n = 2, the result of the expression is 9.
If n = 3, then the square of n is equal to 9, and the sum of 5 and the square of n is equal to 14. Therefore, if n = 3, the result of the expression is 14.
If n = -1, then the square of n is equal to 1, and the sum of 5 and the square of n is equal to 6. Therefore, if n = -1, the result of the expression is 6.
If n = -2, then the square of n is equal to 4, and the sum of 5 and the square of n is equal to 9. Therefore, if n = -2, the result of the expression is 9.
If n = -3, then the square of n is equal to 9, and the sum of 5 and the square of n is equal to 14. Therefore, if n = -3, the result of the expression is 14.
In conclusion, the value of the sum of 5 and the square of a number varies depending on the value of n. When n = 1, the result of the expression is 6, when n = 2, the result is 9, and when n = 3, the result is 14. The same applies when n is negative.
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I do not know these questions
Step-by-step explanation:
1). 3/42). 5/2
3). 7/9
4). 12/5
5).5/6
please mark me brainliestA body moves on a coordinate line such that it has a position s=f(t)=t^2-6t+5 on the interval 0≤t≤8, with s in meters and t in seconds.
a. Find the body's displacement and average velocity for the given time interval.
b. Find the body's speed and acceleration at the endpoints of the interval.
c. When, if ever, during the interval does the body change direction?
The coordinate line such that it has a position s=f(t)=t^2-6t+5 on the interval 0≤t≤8, body changes direction at `t=3s`.
Given that the position of the body is s = f(t) = [tex]t^2[/tex] − 6t + 5 on the interval 0≤t≤8 on a coordinate line.
Here, s is in meters and t is in seconds.
We need to find the following.
A) The body's displacement and average velocity for the given time interval.
B) The body's speed and acceleration at the endpoints of the interval.
C) The interval does the body change directionLet's solve each part.
A) Displacement is given by the formula:
[tex]$$\Delta s=f(t_2)-f(t_1)$$
$$\Delta s= f(8)-f(0)$$[/tex]
[tex]$$\Delta s=(8)^2-6(8)+5-[0^2-6(0)+5]$$
$$\Delta s=64-48$$
$$\Delta s=16m$$[/tex]
The average velocity is given by the formula:
[tex]$$\overline{v}=\frac{\Delta s}{\Delta t}$$[/tex]
where, [tex]$\Delta t$[/tex] is the time taken.
[tex]$$ \Delta t=8-0=8s$$
$$\overline{v}=\frac{16}{8}$$
$$\overline{v}=2m/s$$[/tex]
B) Speed is the magnitude of velocity.
The velocity is given by
The acceleration is given by [tex]v=\frac{ds}{dt}=f'(t)$$[/tex]
[tex]a=\frac{dv}{dt}=f''(t)$$[/tex]
Let's calculate the velocity at the endpoints of the interval.
[tex]$$v(0)=f'(0)=2(0)-6= -6m/s$$[/tex]
[tex]$$v(8)=f'(8)=2(8)-6= 10m/s$$[/tex]
Let's calculate the acceleration at the endpoints of the interval.
[tex]$$a(0)=f''(0)=2m/s^2$$[/tex]
[tex]$$a(8)=f''(8)=2m/s^2$$[/tex]
C) The body changes direction at the point where the velocity changes its sign.
Let's find the point where the velocity changes its sign.
[tex]$$v(t)=0$$
$$2t-6=0$$
$$2t=6$$
$$t=3s$$[/tex]
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(a) The body's displacement and average velocity for the given time interval is 21 m and 2 m/s respectively.
(b) The body's speed and acceleration at the endpoints of the interval is 10 m/s and 2 m/s² respectively.
(c) The interval at which the body changes direction is 0 ≤ t ≤ 3 s.
What is the body's displacement?(a) The body's displacement and average velocity for the given time interval is calculated as follows;
s = f(t) = t² - 6t + 5
0 ≤ t ≤ 8 s
f(0) = 0 - 0 + 5 = 5 m
f(8) = 8² - 6(8) + 5 = 21 m
displacement = 21 m - 5 m = 16 m
average velocity = ( 16 m ) / (8 s - 0 s ) = 2 m/s
(b) The body's speed and acceleration at the endpoints of the interval is calculated as;
v = f'(t) = 2t - 6
v(8) = 2(8) - 6 = 10 m/s
a = dv/dt = 2 m/s²
(c) the time to reach maximum height is calculated as;
v = 2t - 6
0 = 2t - 6
2t = 6
t = 3 s
Interval = 0 ≤ t ≤ 3 s
the height when the direction is changed;
f(3) = (3²) - 6(3) + 5
f(3) = - 4m
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Before doing the actual calculation, let's round 11.5 feet to the nearest foot. Since 11.5 is exactly halfway between 11 and 12, it is technically equal distance from both. But, according to the Rounding Rules," if the number being looked at (in this case the 5) is 5 or above (so, if it's a 5, 6, 7, 8 or 9), give it a shove! If it it a shove! If it is 4 or below (4, 3, 2, 1 or 0), let it go (meaning that it stays the same)! How much carpet is needed?
The 12 feet of carpet is needed.
To round 11.5 feet to the nearest foot, we look at the decimal part, which is 0.5. According to the Rounding Rules, if the number being looked at is 5 or above, we round up by giving it a shove! Since 0.5 is exactly 5, we round up to the next whole number, which is 12 feet.
So, after rounding 11.5 feet to the nearest foot, we get 12 feet.
To determine how much carpet is needed, we use the rounded measurement, which is 12 feet.
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Find the set A U U.
U=(a, b, c, d, e, f, g, h)
A={c, d, g, h)
Select the correct choice below and, if necessary, fill in the answer box to complete your choice.
OA. AUU={__} (Use a comma to separate answers as needed.)
OB. AUU =Ø
The set A U U is:
A U U = {a, b, c, d, e, f, g, h}
How to find the set A U U?A set is a collection or grouping of distinct objects, which are called elements or members of the set. These objects can be anything: numbers, letters, shapes, or even other sets.
We have:
A= {c, d, g, h}
U= {a, b, c, d, e, f, g, h}
A U U is the set of all elements (letters) that appear in both A and U. Thus, we can say:
A U U = {a, b, c, d, e, f, g, h}
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In the graph, the area below f(x) is shaded and labeled A, the area below g(x) is shaded and labeled B, and the area where f(x) and g(x) have shading in common is labeled AB. Graph of two intersecting lines. The line f of x is solid and goes through the points 0, 4, and 4, 0 and is shaded below the line. The other line g of x is solid, and goes through the points 0, negative 1 and 2, 5 and is shaded below the line. The graph represents which system of inequalities? y ≤ −3x − 1 y ≤ −x − 4 y > −3x + 1 y ≤ −x − 4 y < 3x − 1 y ≤ −x + 4 y ≤ 3x − 1 y ≥ −x + 4
The graph represents the system of inequalities: y ≤ −3x − 1 and y ≤ −x + 4.
The graph represents the system of inequalities: y ≤ −3x − 1 and y ≤ −x + 4.
Let's analyze the given information step by step:
Line f(x) goes through the points (0, 4) and (4, 0) and is shaded below the line.
This means that the region below line f(x) is labeled A.
Since line f(x) is solid, the inequality associated with it must be y ≤ −3x − 1.
Line g(x) goes through the points (0, -1) and (2, 5) and is shaded below the line.
This means that the region below line g(x) is labeled B.
Since line g(x) is also solid, the inequality associated with it must be y ≤ −x + 4.
The shaded area where f(x) and g(x) have shading in common is labeled AB.
This means that the overlapping region satisfies both inequalities.
Combining the information, we find that the system of inequalities represented by the graph is:
y ≤ −3x − 1 (corresponding to line f(x))
y ≤ −x + 4 (corresponding to line g(x))
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Saidhari bought a toaster oven for $105. This price was 1/4 off the list price.
Answer:
The list price would be $420.
What is the solution? 3x + 5 = 3x - 5
Answer:
0
Step-by-step explanation:
Certainly! Let's solve the equation step by step:
1. Write down the equation:
3x + 5 = 3x - 5
2. Attempt to isolate x by subtracting 3x from both sides:
3x - 3x + 5 = 3x - 3x - 5
3. Simplify the equation:
5 = -5
At this point, we see that the equation 5 = -5 is not true. This means there is no solution for x in the given equation, as the two sides of the equation cannot be equal.
Evaluate:
10
8(2)n-1
n=1
S = [?]
Remember: for a geometric series, S = (1 – r")
1-r
Enter
Evaluating when [tex]\( n = 1 \)[/tex], the value of S is: S = 1
How to determine the value of SEvaluate:
[tex]\[ S = 108(2)^{n-1} \][/tex]
When n = 1.
Remember: For a geometric series, the sum can be calculated using the formula:
[tex]\[ S = 108(2)^{n-1} \][/tex]
In this case, we have r = 2, since each term is multiplied by 2 to get the next term.
Substituting the values into the formula, we get:
[tex]\[ S = \frac{{(1 - 2^n)}}{{1 - 2}} \][/tex]
Simplifying further:
[tex]\[ S = \frac{{1 - 2^n}}{{-1}} \][/tex]
Since the denominator is -1, multiplying the numerator and denominator by -1, we get:
[tex]\[ S = 2^n - 1 \][/tex]
Therefore, when [tex]\( n = 1 \)[/tex], the value of S is:
S = [tex]2^1[/tex]- 1 = 2 - 1 = 1
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Which property is represented by the equation (8 x 5) x 6.75 = 8 x (5 x 6.75)?
The property represented by the equation (8 x 5) x 6.75 = 8 x (5 x 6.75) is the associative property of multiplication. The associative property of multiplication states that when three or more numbers are multiplied, the product is the same regardless of the grouping of the factors.
This means that if there are multiple numbers to multiply, it does not matter which numbers you multiply first.Here, both sides of the equation are equal: (8 x 5) x 6.75 = 340.5, and 8 x (5 x 6.75) = 340.5.
This shows that you can multiply the numbers in any order and still end up with the same product. Therefore, this equation represents the associative property of multiplication.
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A bag of sweets contains only red sweets and yellow sweets. Thre are twice as many red as yellow. What fraction of the sweets are red?
Answer:
2/3
Step-by-step explanation:
Please answer the builders one URGENT thank you
a) The total number of days to finish by the builders is: 112 days
b) The speed per 1 hour is: 19 km/hr
How to Solve Algebraic Expressions?An algebraic expression is the idea of representing numbers in letters or alphabets without specifying the actual values. In Algebra Basics, we learned how to use letters such as x, y, and z to represent unknown values. These characters are called variables here. Algebraic expressions can use a combination of variables and constants. Any value that comes before the variable and is multiplied is a factor.
a) The builders complete 3/8 of a project in 42 days.
If the total number of days to finish is x, then we can say by proportion that:
(3/8)x = 42
x = (42 * 8)/3
x = 112 days
b) The rate of speed is 38 km per 2 hours.
Thus speed per hour = 38/2 = 19 km/hr
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A town’s population increases at a constant rate. In 2010 the population was 57,000
By 2012 the population had increased to 80,000 If this trend continues, predict the population in 2016.
Answer:
126000
Step-by-step explanation:
if from 2010 to 2012 there was an increase of 23000 that means every two years 23000 people are added then add 23000 to 80000 for four years and you will get 126000.In other words if you get 23000 divide it by two to get the amount for one year then multiply it by 8
Simplify the expression.
−7.94 + 2.5
A −5.44
B −8.19
C −10.44
D 54.40
Answer:
A) -5.44
Step-by-step explanation:
-7.94 + 2.5 = -5.44
-7.94
+ 2.50
-------------
-5.44
Hope this helps! :)
Answer:
-5.44
Step-by-step explanation:
Align the decimals.
since the greatest value (7.94) is having negative sign(-), your answer remains negative.
- 7.94
2.5
-5.44
In a city of 801,100 people, there are 99 coffee shops. What is the number of coffee shops per capita? Round to 6 decimal places.
The number of coffee shops per capita in the city is approximately 0.000124.
To calculate the number of coffee shops per capita in the given city, we divide the total number of coffee shops by the total population and round the result to six decimal places.
Number of coffee shops: 99
Population: 801,100
Coffee shops per capita = Number of coffee shops / Population
Coffee shops per capita = 99 / 801,100
Coffee shops per capita = 0.000123719
Rounding the result to six decimal places, the number of coffee shops per capita in the city is approximately 0.000124.
This means that for every person in the city, there are approximately 0.000124 coffee shops available. Another way to interpret this is that, on average, each person in the city can expect to have access to 0.000124 coffee shops.
Please note that this calculation assumes an equal distribution of coffee shops throughout the city and does not take into account factors such as location, density, or other variables that may affect coffee shop accessibility.
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for y=6/5x-2, which value represents the slope of a line parralel to the equation 5/6 6/5 -1/2 1/2
Answer:
The slope of a line parallel to the equation y = (6/5)x - 2 is 6/5.
Step-by-step explanation:
In general, when two lines are parallel, they have the same slope. Therefore, any line that is parallel to the given equation will have a slope of 6/5.
You have a sphere. If you multiply the radius by 8, what happens to each of the following measurements
(Need the surface area and volume)
Find the value of X
4,
6,
5,
3
Answer:
C) 5
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Apply the intersecting chords theorem, which states that:
the products of the lengths of the line segments on each chord are equal.It gives us the following equation:
2x*4 = 5*(x + 3)Solve it for x:
8x = 5x + 158x - 5x = 153x = 15x = 5The matching choice is C.