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marshall27 [118]
3 years ago
12

Please help! Brainiest

Mathematics
2 answers:
insens350 [35]3 years ago
7 0

Answer:

x=1

Step-by-step explanation:

x=1 then y=4

Sveta_85 [38]3 years ago
5 0

Answer:

the answer is to because the other arrow is on the 2

Step-by-step explanation:

2+2=4

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A random sample of 200 people was taken. 90 of the people in the sample favored Candidate A. We are interested in determining wh
mafiozo [28]

Answer:

a. 1.44

Step-by-step explanation:

We are interested in determining whether or not the proportion of the population in favor of Candidate A is significantly more than 40%.

At the null hypothesis, it is tested if the proportion is of at most 40%, that is:

H_0: p \leq 0.4

At the alternative hypothesis, it is tested if the proportion is of more than 40%, that is:

H_1: p > 0.4

The test statistic is:

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

In which X is the sample mean, \mu is the value tested at the null hypothesis, \sigma is the standard deviation and n is the size of the sample.

0.4 is tested at the null hypothesis:

This means that p = 0.4, \sigma = \sqrt{0.4*0.6}

A random sample of 200 people was taken. 90 of the people in the sample favored Candidate A.

This means that:

n = 200, X = \frac{90}{200} = 0.45

Value of the test statistic:

z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}

z = \frac{0.45 - 0.4}{\frac{\sqrt{0.4*0.6}}{\sqrt{200}}}

z = 1.44

Thus the correct answer is given by option a.

8 0
3 years ago
Please help me! Given (x+a)(x+b) = x^2+x-12, what is the value of a^2+b^2
Sonja [21]
(x + 4) (x - 3)
a = 4
b = -3

a^2 + b^2 = ...
= 4^2 + (-3)^2
= 16 + 9
= 25
4 0
3 years ago
Please help me 11 point's this is all my points
Helga [31]
......................... 1/2
4 0
2 years ago
What is the area of a section of pavement that is 20 ft wide and 70 yd long?
myrzilka [38]

Answer:

A = 4200 ft^2

Step-by-step explanation:

We know the formula for area is

A = l*w

We need to have the same units

convert yd to ft

1 yd = 3ft

Multiply each by 70

70 yds = 210 ft

A = 210 *20

A = 4200 ft^2



6 0
3 years ago
In the high jump event at the city track meet ronald successfully jumped 4 feet and 6 inches. Luis successfully jumped 3 feet an
Genrish500 [490]

Answer:

Ronald by 9 inches

Step-by-step explanation:

Ronald jumped a total of 54inches

Luis jumped a total of 45 inches

8 0
3 years ago
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