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3 years ago

Which number sentence does the following number line represent A. 3+2=5 B. -3+5=2 C. 2+(-3)=5 D. 2+(-5)=-3

Mathematics

1 answer:

Vika [28.1K]3 years ago

7 0

D.
It starts at 2, goes backwards 5, and ends at -3

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Suppose that a market research firm is hired to estimate the percent of adults living in a large city who have cell phones. 500

Alborosie

Answer:

The 95% confidence interval estimate for the true proportion of adults residents of this city who have cell phones is (0.81, 0.874).

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 $1 - \frac{\alpha}{2}$ .

For this problem, we have that:

$n = 500, \pi = \frac{421}{500} = 0.842$

95% confidence level

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:

$\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.842 - 1.96\sqrt{\frac{0.842*0.158}{500}} = 0.81$

The upper limit of this interval is:

$\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.842 + 1.96\sqrt{\frac{0.842*0.158}{500}} = 0.874$

The 95% confidence interval estimate for the true proportion of adults residents of this city who have cell phones is (0.81, 0.874).

6 0

3 years ago

The vertices of polygon ABCD are at A(1, 1), B(2, 3), C(3, 2), and D(2, 1). ABCD is reflected across the x-axis and translated 2

rjkz [21]

The vertices of polygon ABCD are at A(1, 1), B(2, 3), C(3, 2), and D(2, 1). ABCD is reflected across the x-axis and translated 2 units up to form polygon A′B′C′D′. Match each vertex of polygon A′B′C′D′ to its coordinates.Tiles
(2, 1)A′(2, -1)
(1, 1)B′<span>(-3, 4)</span>
(3, 0)C′(2, -1)
(2, 3)D′(-2, 5)

8 0

2 years ago

Read 2 more answers

PLS HELP GIVING BRAINLESS TO CORRECT PERSON PLS HELP ASAP

irina [24]

Answer:

Correct Answer - It shows the unit rate of the graph in miles per hour.

Step-by-step explanation:

hope this helps

8 0

2 years ago

I attached the math problem below and I hope u guys help me. Thxs to who's gonna answer!

vova2212 [387]

Answer:

Numbers | least to greatest | opposites | opposites least to greatest

1/4, -1/2 | -1/2, 1/4 | -1/4, 1/2 | -1/4, 1/2

2, -10 | -10, 2 | -2, 10 | -2, 10

0, 3 1/2 | 0, 3 1/2 | 0, -3 1/2 | -3 1/2, 0

-5, -5.6 | -5.6, -5 | 5, 5.6 | 5, 5.6

24 1/2, 24 | 24, 24 1/2 | -24 1/2 -24 | -24 1/2 -24

-99.9, -100 | -100, -99.9 | 99.9, 100 | 99.9, 100

-0.05, -0.5 | -0.5, -0.05 | 0.5, 0.05 | 0.05, 0.5

-0.7, 0 | -0.7, 0 | 0.7, 0 | 0, 0.7

100.02, 100.04 | 100.02, 100.04 | -100.02, -100.04 | -100.04, -100.02

Hope this helps you!!!!

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2 years ago

Drag each equation to the model and situation it matches.<br> (Picture) *I will give a brainliest

arlik [135]

Answer:

First model gets the equation: y = 2 . 2^z

Second model gets the equation: y = 4^z

Third model gets the equation: y: = 4 . 2^z

7 0

2 years ago