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3 years ago

12

Anyone know if so help please

2 answers:

irina1246 [14]3 years ago

5 0

Yes the correct answer is A !!

DanielleElmas [232]3 years ago

3 0

I am pretty sure it’s A.

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Got the answer to this so i guess FRE POINTS A scientist made measurements of the average change in temperature each month for a

tester [92]

Answer:

Yay free point thx

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3 years ago

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B) Re-write the statement 16 + 5 + 2 - 1 by including one pair of brackets

Furkat [3]

B) 16 + (5 + 2) - 1

I don’t know what C is

3 0

3 years ago

Which best describes the diameter of a circle?

kondor19780726 [428]

Which best describes the diameter of a circle?

<em>Statements</em>

<u><em>A. The distance from the center to any point of the circle</em></u>

This statement describes the radius of the circle

<u><em>B. The length of a chord that contains the center of the circle</em></u>

This statement describes the diameter of the circle

<u><em>C. The distance around the circle</em></u>

This statement describes the circumference of the circle

<u><em>D. The length of a chord that does not contain the center of the circle</em></u>

This statement describes a line segment linking any two points on a circle that does not contain the center of the circle

therefore

<u>the answer is the option</u>

B. The length of a chord that contains the center of the circle

5 0

3 years ago

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You are contacted by a phone-in technical support business that is interested in some information about the amount of time their

Gennadij [26K]

Answer:

The average hold time is 10.47 minutes.

Step-by-step explanation:

Let <em>X</em> = time the customers of a phone-in technical support business spend on hold.

The population mean of the random variable <em>X</em> is, <em>μ</em> = 11 minutes.

The population standard deviation of the random variable <em>X</em> is, <em>σ </em>= 1.16 minutes.

A random sample size, <em>n</em> = 62 callers are selected.

According to the Central limit theorem if large samples (<em>n</em> > 30) are selected from an unknown population with mean <em>μ</em> and standard deviation <em>σ</em> then the sampling distribution of sample mean ( $\bar x$ ) follows a Normal distribution.

The mean of the sampling distribution of sample mean is:

$\mu_{\bar x}=\mu=11$

The standard deviation of the sampling distribution of sample mean is:

$\sigma_{\bar x}=\frac{\sigma}{\sqrt{n}}=\frac{1.16}{\sqrt{62}}=0.147$

It is provided that $P(\bar X>a)=0.79$ .

Compute the value of <em>a</em> as follows:

$P(\bar X>a)=0.79\\P(Z>z)=0.79\\1-P(Z$

The value of <em>z</em> for the above probability is, <em>z</em> = -0.806.

The value of <em>a</em> is:

$z=\frac{a-\mu_{\bar x}}{\sigma_{\bar x}}\\-0.806=\frac{a-11}{0.147}\\a=11-(0.86\times 0.147)\\a=10.87$

Thus, the average hold time is 10.47 minutes.

3 0

3 years ago

Solve this system of linear equations. Separate

attashe74 [19]

Answer:

$(-\frac{7}{13},\frac{79}{13})$

Step-by-step explanation:

Given:

Two equations are given.

$- 7x + 3y = 22$ ------(1)

$4x + 2y = 10$ ----------(2)

Solve equation 1 for y.

$- 7x + 3y = 22$

$3y = 22+7x$

$y=\frac{22+7x}{3}$ -----------(3)

Now, we substitute y value in equation 2.

$4x + 2(\frac{22+7x}{3}) = 10$

$\frac{12x + 2(22+7x)}{3} = 10$

$12x + 2(22+7x)=10\times 3$

$12x + 44+14x=30$

$26x=30-44$

$26x=-14$

$x=-\frac{14}{26}$

$x=-\frac{7}{13}$

Now, we substitute x value in equation 1.

$- 7(-\frac{7}{13}) + 3y = 22$

$\frac{7\times 7}{13} + 3y = 22$

$\frac{49}{13} + 3y = 22$

$3y = 22-\frac{49}{13}$

$3y = \frac{13\times 22-49}{13}$

$3y = \frac{286-49}{13}$

$y = \frac{237}{13\times 3}$

$y = \frac{237}{39}$

$y = \frac{79}{13}$

Therefore, the value of x and y is $(x=-\frac{7}{13},y = \frac{79}{13})$

7 0

4 years ago