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3 years ago

How many edges does a dodecahedron have ?

Mathematics

2 answers:

balu736 [363]3 years ago

4 0

Answer:

Step-by-step explanation:

posledela3 years ago

4 0

I think it’s 30 to be honest I looked it up and it said it was 30 hopefully this helps

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Subtract -5x^2+2x-5−5x 2 +2x−5 from 7x^2-47x 2 −4.

marta [7]

Answer:

-12x^2+46x-6

Step-by-step explanation:

combine like tens and subtract then from eachother

5 0

2 years ago

In a study of government financial aid for college students, it becomes necessary to estimate the percentage of full-time coll

ICE Princess25 [194]

Answer:

a) n = 1037.

b) n = 1026.

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:

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

99% confidence level

So $\alpha = 0.01$ , z is the value of Z that has a pvalue of $1 - \frac{0.01}{2} = 0.995$ , so $Z = 2.575$ .

(a) Assume that nothing is known about the percentage to be estimated.

We need to find n when M = 0.04.

We dont know the percentage to be estimated, so we use $\pi = 0.5$ , which is when we are going to need the largest sample size.

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

$0.04 = 2.575\sqrt{\frac{0.5*0.5}{n}}$

$0.04\sqrt{n} = 2.575*0.5$

$(\sqrt{n}) = \frac{2.575*0.5}{0.04}$

$(\sqrt{n})^{2} = (\frac{2.575*0.5}{0.04})^{2}$

$n = 1036.03$

Rounding up

n = 1037.

(b) Assume prior studies have shown that about 55% of full-time students earn bachelor's degrees in four years or less.

$\pi = 0.55$

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

$0.04 = 2.575\sqrt{\frac{0.55*0.45}{n}}$

$0.04\sqrt{n} = 2.575*\sqrt{0.55*0.45}$

$(\sqrt{n}) = \frac{2.575*\sqrt{0.55*0.45}}{0.04}$

$(\sqrt{n})^{2} = (\frac{2.575*\sqrt{0.55*0.45}}{0.04})^{2}$

$n = 1025.7$

Rounding up

n = 1026.

6 0

3 years ago

Complete this question.

Scrat [10]

Answer: The evidence from the story is base of the new church in this period and the first child to be a part in church and church of the church

Step-by-step explanation:

7 0

3 years ago

Explain how to solve this problem. -5 + 18 + (-12) + (-1)

Nana76 [90]

Answer:

Step-by-step explanation:

-5 + 18 + (-12) + (-1)

-5+18-12-1

13-13

6 0

3 years ago

What is 155.78=2.95h+73.18 a. 28 b. 36 c. 3.6 d. none of these

xz_007 [3.2K]

Answer:

a. 28

Step-by-step explanation:

Given:

$155.78=2.95h+73.18$

We need to evaluate given expression to find the value of 'h'.

Solution:

$155.78=2.95h+73.18$

Now first we will apply Subtraction property of equality and subtract both side by 73.18 we get;

$155.78-73.18=2.95h+73.18-73.18\\\\82.6=2.95h$

Now we will use Division property of equality and divide both side by 2.95 we get;

$\frac{82.6}{2.95}=\frac{2.95h}{2.95}\\\\h=28$

Hence After evaluating given expression we get the value of 'h' as 28.

8 0

3 years ago