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Dafna1 [17]
3 years ago
9

After ace is dilated by a factor of 5, it has an area of 100 square inches. What was its area before dilation?

Mathematics
1 answer:
velikii [3]3 years ago
5 0

Answer:

The area of the dilated square is 196

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3 years ago
Students in a statistics class are conducting a survey to estimate the mean number of units students at their college are enroll
Papessa [141]

Answer:

The 95% confidence interval for the average number of units that students in their college are enrolled in is between 11.7 and 12.5 units.

Step-by-step explanation:

We have the standard deviation for the sample, so we use the t-distribution to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 45 - 1 = 44

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 44 degrees of freedom(y-axis) and a confidence level of 1 - \frac{1 - 0.95}{2} = 0.975. So we have T = 2

The margin of error is:

M = T\frac{s}{\sqrt{n}} = 2\frac{1.5}{\sqrt{45}} = 0.4

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 12.1 - 0.4 = 11.7 units

The upper end of the interval is the sample mean added to M. So it is 12.1 + 0.4 = 12.5 units

The 95% confidence interval for the average number of units that students in their college are enrolled in is between 11.7 and 12.5 units.

8 0
3 years ago
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7 0
2 years ago
My meal cost $32.50 and I want to tip<br> 16%. What is my total for that meal?
nadya68 [22]

Answer:

Step-by-step explanation:

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4 0
3 years ago
Read 2 more answers
X + y = 8 <br> how do i solve for x
IgorC [24]

Answer:

x = 8 - y

Step by step explaination:

==>x + y = 8

==> x = 8 - y

==> substract the value

==> Done

5 0
3 years ago
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