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lukranit [14]
3 years ago
12

5(2x-8)please help. I will mark brainliest!​

Mathematics
2 answers:
kolbaska11 [484]3 years ago
6 0
Answer : 10x-40!!!!!!!!!!!!!
noname [10]3 years ago
5 0

Answer:

just multiply 2x-8 by 5

which is

10x - 40

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There are two spheres of different sizes. The large sphere has a radius 3 times the size of the small sphere. How many times lar
Vikentia [17]

Answer:

The answer to your question is the letter B. 27

Step-by-step explanation:

Data

The Radius of large sphere = 3 times the size of the radius small sphere.

The Ratio of Volume = ?

Formula

Volume of a sphere = 4/3 πr³

Process

1.- Calculate the volume of the large sphere

                   Vl = 4/3 π(3r)³

2.- Calculate the volume of the small sphere

                   Vs = 4/3 πr³

3.- Calculate the ratio

                   Vl / Vs = [4/3π(3r³)] / [4/3 πr³]

- Simplification

                   Vl / Vs = 3³r³ / r³

                   Vl / Vs = 27

7 0
3 years ago
Read 2 more answers
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
Find AC please, help is very much appreciated.
fenix001 [56]

Answer:

AC ≈ 67.9

Step-by-step explanation:

15² = 9 (3x + 1 + 9)

225 = 9 (3x + 10)

225 = 27x + 90

135 = 27x

x ≈ 19.29

AC = (3x + 1 + 9)

AC = 3 (19.2857...) + 1 + 9

AC = 57.857... + 1 + 9

AC =  57.857... + 10

AC ≈ 67.9

4 0
3 years ago
How many months of the year have 28 days??
My name is Ann [436]
All 12 months have 28 days in it.
because every month has 28 days ( February) or more number of days like the other months(Jan, Mar..)
4 0
3 years ago
Plz help meh out on my math hw
Elodia [21]

Hello!

Let's write this as a system of equations.

L=3w

wL=432

Let's plug in our value for L into the second equation, and solve for w.

w(3w)=432

3w²=432

w²=144

w=12

Now, let's plug our w value into the first equation.

L=3(12)

L=36

Therefore, the length is 36 and the width is 12.

I hope this helps!


5 0
3 years ago
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