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3 years ago

I need help with this equation.-2.5+y/6=-16.9

Mathematics

1 answer:

german3 years ago

4 0

Answer:

y= -86.4

Step-by-step explanation:

Not entirely sure but I'm confident in this answer

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The street sign shown is a regular hexagon with side lengths (4x+30) centimeters. The perimeter of the sign is 798 centimeters.

MrRissso [65]

Answer:

25.75

Step-by-step explanation:

A hexagon has 6 sides so

6(4x + 30) = 798

distribute

24x +180 = 798

take away 180 from both sides

24x = 618

divide 24 both sides to get the variable by itself

X = 25.75

7 0

4 years ago

-3(1-8x-2y) in standard form

madreJ [45]

In standard form, -3(1-8x-2y) is:
DISTRIBUTIVE PROPERTY: 3+24x+6y
ANSWER: 24x+6y-3

7 0

4 years ago

Which sequence is geometric and which is arithmetic?

tekilochka [14]

The table on the left is arithmetic

This is because each term is increasing by the same amount (2) each time.

3+2 = 5
5+2 = 7
7+2 = 9
9+2 = 11

--------------------------------------------

The table on the right is geometric

Why? Because this time we are multiplying each term by the same value (2) to get the next term.

3*2 = 6
6*2 = 12
12*2 = 24
24*2 = 48

Both involve the number 2, but the first table uses addition while the second table uses multiplication.

6 0

3 years ago

Read 2 more answers

A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained p

Alekssandra [29.7K]

Using the z-distribution and the formula for the margin of error, it is found that:

a) A sample size of 54 is needed.

b) A sample size of 752 is needed.

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

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

In which z is the z-score that has a p-value of $\frac{1+\alpha}{2}$ .

The margin of error is of:

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

90% confidence level, hence $\alpha = 0.9$ , z is the value of Z that has a p-value of $\frac{1+0.9}{2} = 0.95$ , so $z = 1.645$ .

Item a:

The estimate is $\pi = 0.213 - 0.195 = 0.018$ .

The sample size is n for which M = 0.03, hence:

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

$0.03 = 1.645\sqrt{\frac{0.018(0.982)}{n}}$

$0.03\sqrt{n} = 1.645\sqrt{0.018(0.982)}$

$\sqrt{n} = \frac{1.645\sqrt{0.018(0.982)}}{0.03}$

$(\sqrt{n})^2 = \left(\frac{1.645\sqrt{0.018(0.982)}}{0.03}\right)^2$

$n = 53.1$

Rounding up, a sample size of 54 is needed.

Item b:

No prior estimate, hence $\pi = 0.05$

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

$0.03 = 1.645\sqrt{\frac{0.5(0.5)}{n}}$

$0.03\sqrt{n} = 1.645\sqrt{0.5(0.5)}$

$\sqrt{n} = \frac{1.645\sqrt{0.5(0.5)}}{0.03}$

$(\sqrt{n})^2 = \left(\frac{1.645\sqrt{0.5(0.5)}}{0.03}\right)^2$

$n = 751.7$

Rounding up, a sample of 752 should be taken.

A similar problem is given at brainly.com/question/25694087

5 0

3 years ago

Help me I am struggling on this question.

Naily [24]

The top left box is correct

4 0

3 years ago