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3 years ago

15

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1 answer:

Brums [2.3K]3 years ago

6 0

Answer:

No clue I’m a freshman just doing for points

Step-by-step explanation:

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Can you please help me with this one?

viva [34]

Answer: y=38

x=38

z=109

Step-by-step explanation:

because

4 0

3 years ago

Read 2 more answers

A survey conducted in July 2015 asked a random sample of American adults whether they had ever used online dating (either an onl

Natasha2012 [34]

Answer:

The 99% confidence interval is (0.0787, 0.1613).

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:

The survey included 411 adults between the ages of 55 and 64, and 50 of them said that they had used online dating. This means that $n = 411, \pi = \frac{50}{411} = 0.12$

The 99% confidence interval is

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

The lower limit of this interval is:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{411}} = 0.12 - 2.575\sqrt{\frac{0.12*0.88}{411}} = 0.0787$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{411}} = 0.12 + 2.575\sqrt{\frac{0.12*0.88}{411}} = 0.1613$

The 99% confidence interval is (0.0787, 0.1613).

3 0

4 years ago

The sum of w and 5 into algebraic expression

Alina [70]

Answer: w + 5

Step-by-step explanation: The sum of w and 5 translates into an algebraic expression form to w + 5.

7 0

4 years ago

(2x)^-1<br> how do u put this into a positive exponent and a fraction?<br> 20 points

Naddika [18.5K]

For this case we have that by definition of power properties it is fulfilled that:

$a ^ {-1} = \frac {1} {a ^ 1} = \frac {1} {a}$

Then, if we have the following expression:

$(2x)^{ -1}$

Applying the property, we can rewrite the expression as:

$\frac {1} {(2x) ^ 1} = \frac {1} {2x}$

Answer:

$\frac {1} {2x}$

6 0

4 years ago

The sum of twice a number and 15 is grater the 3

NNADVOKAT [17]

Answer:

x>-6

Step-by-step explanation:

The expression you need to solve for this is: 2x+15>3

For now pretend that the > is a = and solve as you normally would for x.

Subtract 15 from both sides

2x=-12

Divide by 2

x=-6

Put the > back in

x>-6

4 0

3 years ago