Kayla was asked to rewrite the polynomial expression x2 + 6x + 9 how could she rewrite the polynomial

A. The unit cost of the product follows a normal distribution with an expected value of ETB 305 and a standard deviation of ETB 5.

B. The expected value of the unit cost of the product is ETB 305 and the variance is ETB 25.

In order to calculate the standard deviation, follow the following steps:

1. Calculate the mean (average) of your data set.

2. For each data point, subtract the mean and square the result (the squared difference).

3. Sum all of the squared differences.

4. Divide the sum by the number of data points. This gives you the variance.

5. Take the square root of the variance to get the standard deviation.

Therefore, the correct answer is as given above

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Answer: x= -1

Step-by-step explanation:

9x-3(x-5)=6x+3

9x-3x+15=6x+3

9x+6x-3x= 3-15

    15x-3x= -12

         12x= -12

            x= -1

The decision between one sided and two sided alternative hypothesis is based on the statement of the null hypothesis and the alternative hypothesis appropriate for the context of the problem.

The hypothesis test is used to check if the observed data is consistent with the expected data or not. To do this, a null hypothesis and an alternative hypothesis are formulated. The decision between one sided and two sided alternative hypothesis is based on the statement of the null hypothesis and the alternative hypothesis appropriate for the context of the problem. The one-sided alternative hypothesis is used when the researcher is mainly interested in testing whether the population mean is either greater than or less than a given value. On the other hand, the two-sided alternative hypothesis is used when the researcher is mainly interested in testing whether the population mean is either different from or not different from a given value. The level of significance chosen for the test should be determined before the decision is made between one sided and two sided alternatives.

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Using the normal distribution and the central limit theorem, considering that this is a sample proportion, as we are dealing with percentages, it is found that there is a 0.1562 = 15.62% probability of getting less than 50% Democrats in a random sample of size 100.

Normal Probability Distribution

In a normal distribution with mean  and standard deviation , the z-score of a measure X

It measures how many standard deviations the measure is from the mean.  

After finding the z-score, we look at the z-score table and find the p-value associated with this z-score, which is the percentile of X.

By the Central Limit Theorem, the sampling distribution of sample proportions of a proportion p in a sample of size n has mean  and standard deviation .

In this problem:

55% of the registered voters are Democrats, hence .

A sample of size 100 is taken, hence

The mean and the standard deviation of the sampling distribution of sample proportions

The probability of getting less than 50% Democrats in a random sample of size 100 is the p-value of Z when X = 0.5, hence:

By the Central Limit Theorem

has a p-value of 0.1562.

0.1562 = 15.62% probability of getting less than 50% Democrats in a random sample of size 100.

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Answer:

The cost of the wings per dollar is 18/15 = 1.2 wings per dollar.

Answer:

1.2

Step-by-step explanation:

Answer:

The transaction amount for 3: -155.15

The transaction amount for 4: -223.75

Step-by-step explanation:

Square ABCD has a diagonal AC with the given vertices. Find the coordinates of the remaining vertices. A(2, 2) and C(6, - 2)

The coordinates are B(4,-2,) and (4,0)

Coordinates are two numbers (Cartesian coordinates), or sometimes a letter and a number, that locate a specific point on a grid, known as a coordinate plane. A coordinate plane has four quadrants and two axes: the x axis (horizontal) and y axis (vertical). (One way of helping children to remember which of these is which is to tell them that the x axis goes across because ‘x’ is a cross.)

The Cartesian Coordinate System is the name of the two-dimensional plane that is used in math to calculate points using a set of perpendicular lines and basing the points on the place where the line meet. The plane is called a Cartesian plane and Perpendicular lines are lines that intersect at exactly 90 degrees, which makes a right angle.

If A(2,2) and C(6,-2) are the coordinates of two opposite vertices of the square, then the square is a rectangle with a diagonal AC. The remaining vertices of the square can be determined by using the fact that opposite sides of a square are parallel and congruent.

If A(2,2) is one vertex of the square, then the vertex opposite it is C(6,-2)

If C(6,-2) is one vertex of the square, then the vertex opposite it is A(2,2)

The vertex B(x,y) can be found by moving 2 units left from C(6,-2)

x = 6 - 2 = 4

y = -2

so B(4,-2)

The vertex D(x,y) can be found by moving 2 units up from B(4,-2)

x = 4

y = -2+ 2 = 0

so D(4,0)

Therefore, the coordinates of the remaining vertices of the square are B(4,-2) and D(4,0)

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If a machine closes 35 packages per minute. The number of packages the machine can close in 40 minutes is: 1400 packages.

Using this formula to  find the number of packages

Number of packages = Packages per minute machine closes ×   Number of minutes

Let plug in the formula

Number of packages =  35 packages per minute × 40 minutes

Number of packages =  1400 packages

Therefore we can conclude that the number of packages is 1400 packages.

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The complete question is:

A machine closes 35 packages per minute How many packages can the machine close in 40 minutes? Enter your answer in the box. packages?

The parent function for f(x) = -1/2√x+4 can be transformed in a variety of ways to create new functions.

Shifting:

f(x) = -1/2√x+4 + c, where c is the amount of the shift on the y-axis

Reflecting:

f(x) = -1/2√-x+4, where the negative sign reflects the graph across the y-axis

Stretching:

f(x) = k(-1/2√x+4), where k is the amount of the stretch on the y-axis.

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Answer:

240

Step-by-step explanation:

C. 240

The expected value is calculated by taking the total sample size (300) and multiplying it by the hypothesized proportion of graduates who have full-time employment within 6 months of graduation (80%).

Expected value = 300 x (80/100) = 240

The probability of drawing the same color lollipop twice is 0.72.

According to the given question, 3 lollipops were picked up one by one, but after every draw, the lollipop is kept back in the jar. So it is a case of sampling with replacement.

Thereby, there will be 6 cases when the same color i.e red & yellow lollipops will be picked up 2 times i.e, rry, ryr, yrr, yry, yyr, ryy

(where r & y stand for red and yellow lollipops respectively)

And the corresponding probabilities for these six situations will be

(i) 3/5∗3/5∗2/5=18/125

(ii) 3/5∗2/5∗3/5=18/125

(iii)  2/5∗3/5∗3/5=18/125

(iv)  2/5∗3/5∗2/5=12/125

(v)  2/5∗2/5∗3/5=12/125

(vi)  3/5∗2/5∗2/5=12/125

Hence, the required probability will be the sum of all these probabilities i.e,

(i)+(ii)+(iii)+(iv)+(v)+(vi)

=3∗(18/125)+3∗(12/125)

=90/125

so, the probability that the same color Lollipop will be drawn two times is 90/125 or 0.72.

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The 99% confidence interval for population proportion p is 0.117 < P < 0.243 for the true population proportion of people who received flu vaccinations this year when out of 200 people sampled, 36 received flu vaccinations this year.

Given that,

n = 200

x = 36

Point estimate = sample proportion

= x/n = 36/200 = 0.18

1 - p = 1 - 0.18 = 0.82

At a 99% level, the z is,

α = 1 - 0.99 = 0.01

α/2 = 0.005

Zα/2 = 0.005Z = 2.576

The margin of error = E = Zα/2 [tex]\sqrt{p(1-p)} /n[/tex]

= 2.576[tex]\sqrt{0.18*0.82} /200[/tex]

E = 0.063

A 99% confidence interval for population proportion p is,

p - E < P < p + E

0.18 - 0.063 < P < 0.18 + 0.063

0.117 < P < 0.243

Therefore, the 99% confidence interval for population proportion p is 0.117 < P < 0.243 for the true population proportion of people who received flu vaccinations this year when out of 200 people sampled, 36 received flu vaccinations this year.

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Step-by-step explanation:

To calculate how much should be placed in an account now to have $21,200 cash for a new car 7 years from now, we can use the formula for compound interest:

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

Where:

A = future value (amount of money after t years)

P = present value (amount of money now)

r = annual interest rate (as a decimal)

n = number of times the interest is compounded per year

t = number of years

In this case, we have:

A = $21,200

r = 0.064 (6.4% as a decimal)

t = 7

n = 1 (the interest is compounded annually)

So, we can solve for P:

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

P = $21,200 / (1 + 0.064)^(7)

P = $15,093.35

Therefore, the person should place $15,093.35 in an account now to have $21,200 cash for a new car 7 years from now, at an annual interest rate of 6.4%.

The point (-5,3) is in the same quadrant as the fourth vertex of the square.

The given points are representing the points in the quadrant of the cartesian coordinate system. According to this any location on a 2-D plane is represented by 2 numbers, x and y, where x represents the horizontal displacement from the origin of the plane and y represents the vertical displacement from the origin.

Since the given points are the vertices of a square they must be in the form (c, d), (c, -d), (-c, -d), and (-c,d). So, from the given points only the B (-5,3) satisfies the given condition and forms the square.

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Kris currently has $190 and wants to have at least $1,625 by the end of the summer. To find out how much money she needs to earn each weekend we need to subtract the money she already has from the money she wants to have and divide that by the number of weekends.

$1,625 - $190 = $1,435

$1,435 ÷ 8 = $179.38

So, Kris needs to earn at least $179.38 each weekend to reach her goal.

Answer choice C. Kris needs to earn at least $179.38 each weekend to meet her goal. is the best interpretation of the solution in the context of the problem.

Sampling variation will have more impact on confidence interval but it is not accounted for by the margin of error.

What is Sampling variation?

The term "sampling variance" describes how much a sample estimate (a statistic) is likely to fluctuate from sample to sample due to the unique nature of each sample.

Sample Sizes and Variability are the factors which lead to sampling variation. As and when the sample size is changed i.e. either increased or decreased, the variability of samples fluctuates.

Since, Sam runs a large chain of car repair shops, this means he has large number of employees.

But his sample size is only of 10 employees whom he asks about their billable hours from which he constructs a 95% confidence interval for the true mean number of billable hours for all employees in the company.

Since, sampling variation is greatly affected by the sample size and variability, therefore it will have more impact on confidence interval.

Hence, sampling variation will have more impact on confidence interval but it is not accounted for by the margin of error.

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Since the options are missing in the question, here are the options from which answer is to be chosen

a) The information not required in the tax computation is; the amount of the bill

b) The total bill is calculated as; $12.65

A percentage is defined as a number or ratio that is expressed as a fraction of 100.

The parameters are that a restaurant customer left ​$1.65 as a tip, the tax was 4 % and the tip was 15​% of the after tax cost. Thus;

Let the bill after the tax plus tip will be a and the bill after tax be b,

Therefore,

a = b + $1.65

Since $1.65 = 15% of b, then we have;

b = 1.65*100/15

b = 11

a = 11 + 1.65

a = 12.65

Hence, the total cost after the tip = $12.65

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Answer:

  A, B, C, D

Step-by-step explanation:

You want to know which of these equations have exactly one solution:

An equation in a single variable will have one solution if the variable terms on either side of the equal sign have different coefficients.

  A: coefficients are -13 and +13; one solution (x=25/26)

  B: coefficients are 12 and 13; one solution (x=0)

  C: coefficients are -13 and +13; one solution (x=-1/26)

  D: coefficients are 12 and 13; one solution (x=24)

All of the given equations have exactly one solution.

Using the ratio, if a certain piece of brass requires 10kg of zinc, the weight of the copper required for the same piece is 15 kg.

A ratio expresses the frequency with which one number contains another. If a fruit dish contains eight oranges and six lemons, the orange-to-lemon ratio is eight to six. Similarly, the orange to lemon ratio is 6:8, while the orange to total fruit ratio is 8:14.

Here,

Given that a company uses copper and zinc in a weight-to-weight ratio of 3:2 to make bronze. As a result, the metal ratio can be written as,

3/2 = copper/zinc

Now, because the zinc weighs 10 kilograms.

As a result, the ratio can be depicted as,

3/2 = copper / zinc

3/2 = copper / 10kg

3 x 10 /2 =copper

30/2 = copper

15 = copper

As a result, if 10kg of zinc is required for a specific piece of bronze, the weight of copper required for the same piece is 15kilograms.

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Answer:

  I1 ≈ 103.6∠68.7° mA

  I2 ≈ 163.7∠50.3° mA

Step-by-step explanation:

Given equations for mesh currents, you want to find their values in polar form.

The coefficients of these equations can be used to fill an augmented matrix, which can then be reduced by a suitable calculator to give the values of the variables.

  I1 = (14+j36)/373 ≈ 0.1036∠68.7°

  I2 = (39+j47)/373 ≈ 0.1637∠50.3°

__

Additional comment

The equations can be solved "by hand" using any of the usual methods: substitution, elimination, Cramer's Rule, and others. The complex arithmetic makes it tedious, but not significantly more difficult. A suitable calculator reduces the work substantially.

The second attachment shows more working using the "cross multiplication method", similar to Cramer's Rule.

Answer:

[tex]y = \frac{1}{3} x - 4[/tex]

[tex]\it y=ax+b\\ \\ x=0 \Rightarrow y=-4 \Rightarrow b=-4 \Rightarrow y=ax-4\\ \\ x=3 \Rightarrow y=-3 \Rightarrow a\cdot3-4=-3\bigg|_{+4}\Rightarrow a\cdot3=1 \bigg|_{:3}\Rightarrow a=\dfrac{1}{3} \\ \\ Therefore, the\ equation\ of\ this \ line\ is: \ \ y=\dfrac{1}{3}x-4[/tex]

Answer:4x+3

Step-by-step explanation:

Given the following in the question if:

Volume of the box= 4x3+19x2+12z

Height of the box= x

width of the box =?

we have to find the width of the box, so as we know that

box is in the shape of cuboid, so

Volume of the cuboid = length * width * height

4x3+9x2+12x   =   x+4* width * x

width = 4x3+9x2+2x/x2+4x

we have to use long division method for this algebraic expression to divide and find width of the box.

we get width= 4x+3

Hence, the width of the box which in the shape of cuboid is 4x+3

The dealerships will each have sold 23 cars in 1 day.

The first step is to form a linear equation that represents the number of cars that are sold by the dealerships. A linear equation is an equation that has a single variable that is raised to the power of one.

The form of a linear equation that represents the total cars sold by the dealership is:

Total cars sold = cars already sold + (number of cars sold per day x number of days)

Total cars sold by Clarksville Cars= 15 + (8 x d)

= 15 + 8d

Total cars sold by Robinson's Autos = 13 + (10 x d)

= 13 + 10d

When the two dealerships are tied, the two above functions would be equal:

13 + 10d= 15 + 8d

In order to determine the value of d, take the following steps:

Combine and add similar terms:

10d - 8d = 15 - 13

2d = 2

Divide both sides of the equation by 2

d = 2 / 2

w = 1 week

Number of cars that would have been sold by each dealership =

13 + 10(1)

13 + 10 = 23 cars

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The graph of "square root of 13" is 3.61 is seen below.

So, the graph of "square root of 13" = 3.61 is seen below.

As a result, the quotient obtained using the aforementioned division approach, or roughly 13 = 3.605, is the necessary square root of 13.

Plotting the number "square root of 13" on the number line is necessary.

since we are aware,

13 has a square root of 3.61.

In other words, we must write 3.61 on the number line.

Since 3.61 is between 3 and 4, it tends to lean more toward 4.

So, the graph of "square root of 13" = 3.61 is seen below.

The graph of "square root of 13" is 3.61 is seen below.

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Answer:

2x, 2x + 2

Step-by-step explanation:

2x is even

2x + 2 = 2(x+1)

x and x+1 are consecutive integers

So multiplying both by 2 makes  them consecutive even integers

For example with x = 1

2x = 2, 2(x+1) = 2 . 2 = 4 which is next even consecutive integer

Answer:

2x, 2x + 2

Step-by-step explanation:

Each expression is divisible by 2, so it is even.

The center of the circle is (3 , -2) and the radius is 4 then the equation of circle is (x)² + (y)²-6x+4y = 3

What is a circle?

The circle is defined as the locus of the point traces around a fixed point called as the center and is equidistant from the outer trace.

All points in a plane that are at a specific distance from a specific point, the center, form a circle. In other words, it is the curve that a moving point in a plane draws to keep its distance from a specific point constant.

The equation of the circle is,

( x - h )² + ( y - k )² = r²

(x-3)² + (y+2)² = 16

(x)² + (y)²-6x+9 +4y+4 = 16

(x)² + (y)²-6x+4y = 3

Compare the equations and find the center and radius,

Center = ( h,k) = ( 3, -2)

Radius = r = 4

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if there are 5 people and 2 have to sit next to each other and 2 others cant sit next to each other, then 30 combinations possible

What are combinations?

A combination is a calculation that determines the number of possible arrangements in a collection of items in which the order of the selection does not matter. In combinations we can select the items in any order.

nn!/r!(n-r)!

Number of ways=5

=5!/2!2!

=5!/2*2

=5*4*3*2/2*2

=30

=30 ways

if there are 5 people and 2 have to sit next to each other and 2 others cant sit next to each other, then 30 combinations possible

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The probability that the first item is not the first to be delivered is 0.6667

Let's call the events that the first, second, and third items arrive on the first day of February A, B, and C, respectively.

Therefore, the probability that one of the other two items arrives first is

1/3 + 1/3 = 2/3.

The probability that the first item is not the first to be delivered is

1 - 2/3 = 1/3

Evaluate

1 - 2/3 = 0.6667

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C) 1/2 is the value of P(A)

Independent events are events in probability and statistics that have no effect on each other and are not related to each other in any way, so the outcome of one event does not affect the outcome of the other event.

let the value of P(A) be x and the value of P(B) be y  given A and B are independent events

so P(A∩B) = P(A) * P(B)

=> x*y=1/6 ---(i)

now P(⁻A) = 1 - P(A) , P(B) = 1 - P(⁻B)

so P( ⁻A  ∩ ⁻B ) = (1-x)*(1-y)

=> 1 -x - y +xy = 1/3

=> x +y  =1+1/6-1/3

=> x + y = 5/6  ----(ii)

x - y = √(x+y)²-4xy

=> √(5/6)² - 4*1/6

=> √25/36 - 4/6

=> √(25-24)/36

=> √1/36

=> 1/6

so x-y = 1/6 ---(iii)

adding equation (ii) and (iii) we get

2x = 1

=> x = 1/2

so P(A)  = 1/2

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Complete question :

If A and B are independent events of random experiment such that P(A∩B)=1/6 and P( ⁻A  ∩ ⁻B )=1/3, then P(A)=?

a. 1/4b. 1/5c. 1/2s. 2/3