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ryzh [129]
3 years ago
6

Use a table to find two consecutive integers between which the solution lies.

Mathematics
1 answer:
jolli1 [7]3 years ago
4 0

Answer:

  -5 and -4

Step-by-step explanation:

It is far easier just to solve the equation than to determine appropriate integer bounds on the solution.

In the attachment, we show a couple of initial trials at solutions. The nearness of y=5 to being correct suggests that the next higher integer may be helpful, too. It is.

We find -4 and -5 to bracket the solution.

_____

The actual solution is (3.4 -1.3)/-0.5 = -4.2.

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A researcher wishes to be 95% confident that her estimate of the true proportion of individuals who travel overseas is within 3%
andre [41]

Answer:  a) 683   b) 1067

Step-by-step explanation:

The confidence interval for population proportion is given by :-

p\pm z_{\alpha/2}\sqrt{\dfrac{p(1-p)}{n}}

a) Given : Significance level :\alpha=1-0.95=0.05

Critical value : z_{\alpha/2}}=\pm1.96

Margin of error : E=0.03

Formula to calculate the sample size needed for interval estimate of population proportion :-

n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2\\\\=0.2(0.8)(\dfrac{1.96}{0.03})^2=682.951111111\approx683

Hence, the required sample size would be 683 .

b) If no estimate of the sample proportion is available then the formula to calculate sample size will be :-

n=0.25(\dfrac{z_{\alpha/2}}{E})^2\\\\=0.25(\dfrac{1.96}{0.03})^2=1067.11111111\approx1067

Hence, the required sample size would be 1067 .

3 0
3 years ago
Which expression is equivalent to 3 + 3/8 − 1/2 ?
andreyandreev [35.5K]

Answer:

2 and 7/8

Step-by-step explanation:

3 + 3/8 - 1/2

3 + 3/8 - 4/8

3 - 1/8

2 and 7/8

5 0
3 years ago
On Monday Greg walks the entire length of a trail that is 3 1/2 miles long on Tuesday he walks the entire length of a trail that
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Answer:

Step-by-step explanation:

3.5+4.6+2.5 = 10.6

7 0
3 years ago
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What quadrent is (-2,7) in
lawyer [7]
Quadrant 2.

This is because the x-value is negative, and therefore is on the left side of the axis; and the y-value is positive, and therefore is on the top side of the axis. Putting this together, we find that (-2.7) is in Quadrant 2. 
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4 years ago
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Which expression is not equal to one fourth of 52?
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Answer:

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Step-by-step explanation:

A) 0.25 x 52 = 13

B) 4% of 52 = 0.04 x 42 = 2.08

C) 52 ÷ 4 = 13

D) 52/4 = 13

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