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3 years ago

Write the equation.

Mathematics

1 answer:

Svetradugi [14.3K]3 years ago

3 0

Answer:

51 × 5 = L

L = $255

Step-by-step explanation:

First, we can have "L" equal the amount of money Lee saved.

L = amount of money Lee saved

If Jessi saved 5 times as much, <u>you can find out how much money Lee saved by multiplying how much Jessi has by 5</u>.

Jessi has $51, so the equation would be <u>51 × 5 = L</u>

51 × 5 = 255

So, Lee has $255 saved.

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Mary and Jane both took PSY230 last semester but they were in two different sections taught by different professors. Mary's clas

Greeley [361]

Answer:

Due to the higher z-score, Jane did better in class.

Step-by-step explanation:

Z-score:

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:

Whoever's grade had the better z-score did better in class.

Mary's:

Mean of 85, standard deviation of 5, grade of 88. This means that $\mu = 85, \sigma = 5, X = 88$ . So

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

$Z = \frac{88 - 85}{5}$

$Z = 0.6$

Jane's

Mean of 80, standard deviation of 10, grade of 88. This means that $\mu = 80, \sigma = 10, X = 88$ . So

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

$Z = \frac{88 - 80}{10}$

$Z = 0.8$

Due to the higher z-score, Jane did better in class.

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3 years ago

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svetlana [45]

Answer:

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$Use:\\\\\dfrac{a^n}{a^m}=a^{n-m}\\\\(a^n)^m=a^{nm}\\\\a^{-n}=\dfrac{1}{a^n}\\\\(ab)^n=a^nb^n$

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2 years ago

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kirill [66]

Answer:

Step-by-step explanation:

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