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Artyom0805 [142]
3 years ago
14

Help will mark brainliest part C

Mathematics
1 answer:
Mekhanik [1.2K]3 years ago
6 0

Answer:

I'm not quite sure but I will do my best

x = 2 ± 1/2(sqrt{2})

x = 2.71

and

x = 1.29

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Find the surface area of this cylinder.<br>Round to the nearest tenth.<br>​
iren2701 [21]

Answer:

282.7

Step-by-step explanation:

surface area of cylinder = 2πR² + 2πRh

R = 3 cm

h = 12 cm

surface area of cylinder = 2π*3² + 2π*3*12 = 90π ≈ 90*3.14 ≈ 282.7 (cm²)

4 0
3 years ago
What percent of 140 is 50.4?
chubhunter [2.5K]

Answer:

36

Step-by-step explanation:

X/100% x 140 = 50.4

X x 140 = 50.4 x 100

X x 140 = 5040

X = 5040/140

X = 36

5 0
3 years ago
In a study of cell phone usage and brain hemispheric​ dominance, an Internet survey was​ e-mailed to 6965 subjects randomly sele
vladimir1956 [14]

The hypothesis test shows that we reject the null hypothesis and there is sufficient evidence to support the claim that the return rate is less than 20%

<h3>What is the claim that the return rate is less than 20% by using a statistical hypothesis method?</h3>

The claim that the return rate is less than 20% is p < 0.2. From the given information, we can compute our null hypothesis and alternative hypothesis as:

\mathbf{H_o :p =0.2}

\mathbf{H_i:p < 0.2}

Given that:
Sample size (n) = 6965

Sample proportion \mathbf{\hat p = \dfrac{x}{n} = \dfrac{1302}{6965} \sim0.1869}

The test statistics for this data can be computed as:

\mathbf{z = \dfrac{\hat p - p}{\sqrt{\dfrac{p(1-p)}{n}}}}

\mathbf{z = \dfrac{0.1869 -0.2}{\sqrt{\dfrac{0.2(1-0.2)}{6965}}}}

\mathbf{z = \dfrac{-0.0131}{0.0047929}}

z = -2.73

From the hypothesis testing, since the p < alternative hypothesis, then our test is a left-tailed test(one-tailed.

Hence, the p-value for the test statistics can be computed as:

P-value = P(Z ≤ z)

P-value = P(Z ≤ - 2.73)

By using the Excel function =NORMDIST (-2.73)

P-value = 0.00317

P-value ≅ 0.003

Therefore, we can conclude that since P-value is less than the significance level at ∝ = 0.01, we reject the null hypothesis and there is sufficient evidence to support the claim that the return rate is less than 20%

Learn more about hypothesis testing here:

brainly.com/question/15980493

#SPJ1

3 0
2 years ago
Can anyone help me solve question B and explain please please please please please please​
hram777 [196]

Answer:

m>2

                                                  ()***********************

<--------------------(-2)-------(0)------(2)--------------------------->

Step-by-step explanation:

3m>m+4

Subtract m on both sides:

3m-m>m+4-m

Simplify both sides:

2m>4

Divide both sides by 2:

m>2

So this means we want values of m greater than 2, not including 2.

                                                  ()***********************

<--------------------(-2)-------(0)------(2)--------------------------->

3 0
3 years ago
Read 2 more answers
Anthony has a cup full of nickels and dimes worth $6.80. There are 82 coins all together.
poizon [28]

Answer:

b

Step-by-step explanation:

4 0
3 years ago
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