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Oduvanchick [21]
2 years ago
8

CAN SOMEONE PLEASE HELP ITS DUE TODAY

Mathematics
2 answers:
nikdorinn [45]2 years ago
7 0

Answer:

n = 6

Step-by-step explanation:

\frac{ {5}^{n}  \times  {5}^{3} }{ {5}^{7} }  =  {5}^{2}  \\  \\  \implies \: \frac{ {5}^{n + 3}  }{ {5}^{7} } =  {5}^{2} \\  \\  \implies \:  {5}^{n + 3 - 7}  =  {5}^{2} \\  \\  \implies \:  {5}^{n  - 4}  =  {5}^{2} \\  \\  \implies \:n - 4 = 2 \\  \\   \implies \:n = 4 + 2 \\  \\  \implies \:n = 6

rodikova [14]2 years ago
4 0

\qquad\qquad\huge\underline{{\sf Answer}}♨

Let's solve ~

\qquad \sf  \dashrightarrow \: \frac{5 {}^{n}  \times  {5}^{3} }{5 {}^{7} }  =  {5}^{2}

\qquad \sf  \dashrightarrow \: \frac{5 {}^{n + 3}    {}^{} }{5 {}^{7} }  =  {5}^{2}

\qquad \sf  \dashrightarrow \:5 {}^{n + 3 - 7} =  {5}^{2}

\qquad \sf  \dashrightarrow \:5 {}^{n - 4} =  {5}^{2}

\qquad \sf  \dashrightarrow \:{}{n - 4} =  {2}

\qquad \sf  \dashrightarrow \:n = 2 + 4

\qquad \sf  \dashrightarrow \:n = 6

Hence, value of n is 6

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a set of average city temperatures in december are normally distributed with a mean of 16.3°C and a standard deviation of 2°C. w
koban [17]

Answer:

19.74% of temperatures are between 12.9°C and 14.9°C

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 question, we have that:

\mu = 16.3, \sigma = 2

What proportion of temperatures are between 12.9°C and 14.9°C?

This is the pvalue of Z when X = 14.9 subtracted by the pvalue of Z when X = 12.9.

X = 14.9

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

Z = \frac{14.9 - 16.3}{2}

Z = -0.7

Z = -0.7 has a pvalue of 0.2420

X = 12.9

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

Z = \frac{12.9 - 16.3}{2}

Z = -1.7

Z = -1.7 has a pvalue of 0.0446

0.2420 - 0.0446 = 0.1974

19.74% of temperatures are between 12.9°C and 14.9°C

3 0
3 years ago
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creativ13 [48]
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Gennadij [26K]

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224 pages total

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7 0
3 years ago
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anyanavicka [17]

Answer:

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Step-by-step explanation:

3 0
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You have $60 and your sister has $120. You are saving $14 per week and your sister is saving $10 per week. How long will it be b
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Answer:

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Step-by-step explanation:

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Sister: 120+10x

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