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Mama L [17]
4 years ago
8

Look at the picture and plzzz help

Mathematics
2 answers:
cricket20 [7]4 years ago
3 0

the answer to the problem would be c

Ipatiy [6.2K]4 years ago
3 0

ANSWER

The correct choice is C.

EXPLANATION

We know that:

\sqrt[3]{7}  =  {7}^{ \frac{1}{3} }

We want to simplify:

( {  {7}^{ \frac{1}{3} } )}^{3}

The exponent here is 3. This means that the base must multiply itself 3 times.

( {  {7}^{ \frac{1}{3} } )}^{3} =   {7}^{ \frac{1}{3} }  \times   {7}^{ \frac{1}{3} }  \times   {7}^{ \frac{1}{3} }

Recall that:

{a}^{m}  \times  {a}^{n}  =  {a}^{m + n}

This implies that,

( {  {7}^{ \frac{1}{3} } )}^{3} =   {7}^{ \frac{1}{3}  +  \frac{1}{3}  +  \frac{1}{3} }

Simplify:

( {  {7}^{ \frac{1}{3} } )}^{3} =   {7}^{ \frac{3}{3}}

( {  {7}^{ \frac{1}{3} } )}^{3} =   {7}^{ 1}  = 7

The correct choice is C

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3 years ago
The time for a professor to grade an exam is normally distributed with a mean of 16.3 minutes and a standard deviation of 4.2 mi
dem82 [27]

Answer:

62.17% probability that a randomly selected exam will require more than 15 minutes to grade

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 16.3, \sigma = 4.2

What is the probability that a randomly selected exam will require more than 15 minutes to grade

This is 1 subtracted by the pvalue of Z when X = 15. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{15 - 16.3}{4.2}

Z = -0.31

Z = -0.31 has a pvalue of 0.3783.

1 - 0.3783 = 0.6217

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8 0
4 years ago
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Arturiano [62]

Answer:

The slope is a) -5.

Step-by-step explanation:

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the difference in slope is \frac{-9 - (-4)}{-5 - (-6)} = \frac{-9 + 4}{-5 +6} =  \frac{-5}{1} = -5

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