Simplify 12(c-3)+27+c-9c

jeka94

7/4 is the answer to your question

6 0

2 years ago

Donna tutors English. for each hour that she tutors, she earns 25 dollars. her earning, E ( in dollars) after tutoring for h hou

pickupchik [31]

$\begin{gathered} E=25h \\ h=\text{ number of hours} \\ E=25\cdot(3) \\ E=75 \\ \text{Donna earns 75dollars for 3 hours} \end{gathered}$

4 0

9 months ago

true or false If x represents a random variable with mean 114 and standard deviation 40, then the standard deviation of the samp

Goshia [24]

Answer:

$\mu = 114, \sigma = 40$

We also know that we select a sample size of n =100 and on this case since the sample size is higher than 30 we can apply the central limit theorem and the distribution for the sample mean would be given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

And the standard deviation for the sampling distribution would be:

$\sigma_{\bar X}= \frac{40}{\sqrt{100}}= 4$

So then the answer is TRUE

Step-by-step explanation:

Let X the random variable of interest and we know that the true mean and deviation for this case are given by:

$\mu = 114, \sigma = 40$

We also know that we select a sample size of n =100 and on this case since the sample size is higher than 30 we can apply the central limit theorem and the distribution for the sample mean would be given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

And the standard deviation for the sampling distribution would be:

$\sigma_{\bar X}= \frac{40}{\sqrt{100}}= 4$

So then the answer is TRUE

6 0

2 years ago

What is the perimeter of the rectangle shown below?

lesantik [10]

Answer: D. 26 units

Step-by-step explanation: perimeter is the distance around the figure, or all the sides added together.
With a rectangle it is known that the opposite sides are congruent, or the same, so 8+8+5+5 = 26

7 0

1 year ago

A mixture requires 4 cups of water for every 7 cups of flour used. How many cups of water should be used with 28 cups of flour

MAVERICK [17]

Answer:

16 cups of water

5 0

2 years ago