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3 years ago

7

Determine the equation of the line shown in the graph: graph of a vertical line with an x intercept of negative 1

2 answers:

vampirchik [111]3 years ago

8 0

Answer:

x = -1

Step-by-step explanation:

Since the graph is a vertical line where all outputs of y-values will only have an input of x = -1, your line would be x = -1. This would not be a function, however, because it doesn't pass the vertical line test.

svp [43]3 years ago

7 0

Answer:

x=-1

Step-by-step explanation:

thing about it. vertial lines dont have a y int unless its on the y axis,

a straight line going through -1,0 would be x= -1

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A sociologist wishes to estimate the percentage of the United States population living in poverty. What size sample should be ob

andriy [413]

Answer:

a) We need a sample size of at least 705.

b) We need a sample size of at least 1692.

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:

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

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a pvalue of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

a) If she uses 1999 estimate of 11.8% obtained from the Current Population Survey.

We need a sample of size at least n

n is found when $M = 0.02, \pi = 0.118$ .

So

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

$0.02 = 1.645\sqrt{\frac{0.118*0.882}{n}}$

$0.02\sqrt{n} = 1.645\sqrt{0.118*0.882}$

$\sqrt{n} = \frac{1.645\sqrt{0.118*0.882}}{0.02}$

$(\sqrt{n})^{2} = (\frac{1.645\sqrt{0.118*0.882}}{0.02})^{2}$

$n = 704.08$

Rounding up

We need a sample size of at least 705.

b) She does not use any estimate.

Same thing as above, we just use $\pi = 0.5$ when do not use any estimate.

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

$0.02 = 1.645\sqrt{\frac{0.5*0.5}{n}}$

$0.02\sqrt{n} = 1.645\sqrt{0.5*0.5}$

$\sqrt{n} = \frac{1.645\sqrt{0.5*0.5}}{0.02}$

$(\sqrt{n})^{2} = (\frac{1.645\sqrt{0.5*0.5}}{0.02})^{2}$

$n = 1691.2$

Rounding up

We need a sample size of at least 1692.

4 0

2 years ago

Three friends just out of culinary school have applied for a loan to open a new restaurant in the heart of New York City. The ba

blsea [12.9K]

Answer:

The answer is 0.3 million per year

Step-by-step explanation:

ok

8 0

2 years ago

A motorcycle daredevil is planning a stunt to perform at a county fair. A ramp must be built to give him a 20%

Shkiper50 [21]

Answer: 95 feet

Step-by-step explanation:

Let the length of the horizontal run be represented by x.

Slope Grade = (Rise/Run) × 100

20 = (19/x) × 100

20 = 1900/x

20x = 1900

x = 1900/20

x = 95

Therefore, the length of the horizontal run must be 95 feet

5 0

2 years ago

A large rock has a mass of 9,000 grams. What is the mass of the rock in kilograms ?

katovenus [111]

The mass of the rock in kg is 90,000 kg

4 0

3 years ago

Read 2 more answers

NEED ASAP!!!!!!!!!!!!. Multiply and express the result in scientific notation:

Snezhnost [94]

Your answer is 8.4 X 10^7.

Hope this helped!

4 0

3 years ago