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3 years ago

PLEASE HELP!!!!!!!!!!!!! GEOMETRY

Mathematics

2 answers:

Sedaia [141]3 years ago

7 0

Perpendicular lines has OPPOSITE, RECIPROCAL slopes.
The green line has a slope of 1/7, the opposite reciprocal is -7/1 or
-7.
LETTER C

lilavasa [31]3 years ago

5 0

Perpendicular, slope is reciprocal and opposite

so answer is C. -7

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3.1 = x / 2 equals what?

neonofarm [45]

Answer: 6.2

Step-by-step explanation: 3.1 = x/2

x/2=3.1

x/2(2)=3.1(2)

x=6.2

3 0

3 years ago

we believe that 42% of freshmen do not visit their counselors regularly. For this year, you would like to obtain a new sample to

Maksim231197 [3]

Answer:

A sample of 1077 is required.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the zscore that has a pvalue of $1 - \frac{\alpha}{2}$ .

The margin of error is of:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

42% of freshmen do not visit their counselors regularly.

This means that $\pi = 0.42$

98% confidence level

So $\alpha = 0.02$ , z is the value of Z that has a pvalue of $1 - \frac{0.02}{2} = 0.99$ , so $Z = 2.327$ .

How large of a sample size is required?

A sample size of n is required, and n is found when M = 0.035. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.035 = 2.327\sqrt{\frac{0.42*0.58}{n}}$

$0.035\sqrt{n} = 2.327\sqrt{0.42*0.58}$

$\sqrt{n} = \frac{2.327\sqrt{0.42*0.58}}{0.035}$

$(\sqrt{n})^2 = (\frac{2.327\sqrt{0.42*0.58}}{0.035})^2$

$n = 1076.8$

Rounding up:

A sample of 1077 is required.

3 0

3 years ago

Round 68.09 to 2 Sf please

marta [7]

68
I hope you understand this

4 0

3 years ago

Can 1/2 be written as a terminating decimal?

igor_vitrenko [27]

Yes it can and the answer would be 0.5

Terminating decimals are numbers that never stop going after the period. Such an example would be 10/3 which would give 3.333333 indefinitely. 1/2 gives a whole number, that is, 0.5

4 0

3 years ago

Please help me answer the question in the picture

Genrish500 [490]

$338 / 2 = $169

A = a^2 = 169
a= 13

answer
13ft

6 0

3 years ago

Read 2 more answers