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3 years ago

Please help I suck at math and this is for a grade

Mathematics

2 answers:

qwelly [4]3 years ago

6 0

C. negative exponents always go at the bottom

Alexandra [31]3 years ago

4 0

The answer is A. If you divide by 2 negatives you get a positive 2 to the second power.

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In 2015 as part of the General Social Survey, 1289 randomly selected American adults responded to this question:

Radda [10]

Answer:

B (0.312, 0.364)

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 interval $1-\alpha$ , 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 $1 - \frac{\alpha}{2}$

For this problem, we have that:

1289 randomly selected American adults responded to this question. This means that $n = 1289$ .

Of the respondents, 436 replied that America is doing about the right amount. This means that $\pi = \frac{436}{1289} = 0.3382$ .

Determine a 95% confidence interval for the proportion of all the registered voters who will vote for the Republican Party. 

So $\alpha = 0.05$ , z is the value of Z that has a pvalue of $1 - \frac{0.05}{2} = 0.975$ , so $z = 1.96$ .

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.3382 - 1.96\sqrt{\frac{0.3382*0.6618}{1289}} = 0.312$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.3382 + 1.96\sqrt{\frac{0.3382*0.6618}{1289}} = 0.364$

The 95% confidence interval is:

B (0.312, 0.364)

5 0

3 years ago

The sum of digits of a cetain two - digit number is 7. Reversing its digits increases the by the number nine. what is the number

const2013 [10]

The number is 34.
3 + 4 = 7
43 - 34 = 9

7 0

3 years ago

Write an expression that is equivalent to the following x + x + x + - 20

ICE Princess25 [194]

3x-20
Hope this helps

5 0

3 years ago

Read 2 more answers

You lean a 30 foot ladder against your house and it reaches exactly to the top. The ladder makes a 24 degree angle with the grou

zhenek [66]

A right triangle is formed with the ladder as the hypotenuse. Since the angle made by the ladder with with ground is given, we can use trigonometric functions to solve for the height of the house.

If we let x be the height of the house and using sine function:
sin 24 = x/30
x = 30 sin 24
x = 12.20 ft

Therefore, the house is 12.20 ft tall

4 0

3 years ago

Given: F(x) = 3x2 + 1, G(x) = 2x - 3, H(x) = x<br><br> F(-2) =

Naddik [55]

Answer:

Use the given functions to set up and simplify:

F(−2) and that equals to 13

Step-by-step explanation:

So, therefore, your answer to the problem is 13.

4 0

3 years ago