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3 years ago

Alpha cube minus beta cube

Mathematics

1 answer:

Pavlova-9 [17]3 years ago

6 0

Answer:

a³-b³=(a-b)³+3ab(a-b)

(a-b)(a²+b²+ab

Step-by-step explanation:

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Please help me with this question! I will mark brainliest if it’s correct

natima [27]

I’m guessing 27 i divided both of the numbers but i’m not sure

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3 years ago

Please help me idk this

Helen [10]

Answer:

A=200.96 in2

Step-by-step explanation:

A=PI x R2

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3 years ago

A simple random sample (SRS) of 150 is taken from a population with a 0.6 proportion of success. An independent SRS of 250 is ta

Virty [35]

Answer:

$SE_{\hat p_1 -\hat p_2}= \sqrt{\frac{0.6(1-0.6)}{150}+\frac{0.3(1-0.3)}{250}}= 0.0494$

Step-by-step explanation:

For this case we have the following data:

$n_1 =150$ represent the random sample 1 selected

$\hat p_1 =0.6$ represent the proportion of success for the sample 1 selected

$n_2 =250$ represent the random sample 2 selected

$\hat p_2 =0.3$ represent the proportion of success for the sample 2 selected

We know for this case that we can use the normal approximation since for both cases we have:

$n_1 p_1 =90 \geq 10, n_1 (1-p_1)=60 \geq 10$

$n_2 p_2 =75 \geq 10, n_2 (1-p_2)=175 \geq 10$

We have the randomization condition and we assume that the two samples are <10% of the entire population size.

So then we can use the following distribution for the proportions:

$p \sim N( \hat p, \sqrt{\frac{\hat p (1-\hat p)}{n}})$

For this case we want to find the distribution for the difference of these two proportions and we have this:

$p_1 -p_2 \sim N (\hat p_1 -\hat p_2 , \sqrt{\frac{\hat p_1 (1-\hat p_1)}{n_1} +\frac{\hat p_2 (1-\hat p_2)}{n_2}})$

So then the dtandard deviation would be given by:

$SE_{\hat p_1 -\hat p_2}= \sqrt{\frac{0.6(1-0.6)}{150}+\frac{0.3(1-0.3)}{250}}= 0.0494$

4 0

4 years ago

Read 2 more answers

find three consecutive integers for which 3 times the sum of the first and third integers is -342? show step by step

Montano1993 [528]

X + (X+1)+ (x+2)=-342
3x+3 =-342
3X=-339
X=-113, -114, -115

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3 years ago

∠A and \angle B∠B are vertical angles. If m\angle A=(7x-8)^{\circ}∠A=(7x−8)

miskamm [114]

Do not click in the link above, he is a scammer and trying to fool us

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3 years ago

Alpha cube minus beta cube​

Alpha cube minus beta cube