What is 15/21 subtracted by 5/7 equal ?

Mathematics

2 answers:

Neporo4naja [7]4 years ago

5 0

Answer:

10 over 7 is the answer

Step-by-step explanation:

Artemon [7]4 years ago

3 0

Answer:

Step-by-step explanation:

Step 1: Make common denominators

What is the LCM of 21 and 7: 7

So, we need to convert both fractions into a 21 denominator.

15/21 * 1/1 = 15/21

5/7 * 3/3 = 15/21

Step 2: Subtract the numbers

15/21 - 5/7 is same as 15/21 - 15/21

15/21 - 15/21

0

Answer: 0

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REY [17]

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3 years ago

Find m A. 12 B. 22 C. 52 D. 38

Nikolay [14]

C. 52

Work:

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3 years ago

According to an NRF survey conducted by BIGresearch, the average family spends about $237 on electronics (computers, cell phones

schepotkina [342]

Answer:

7.64% probability that they spend less than $160 on back-to-college electronics

Step-by-step explanation:

Problems of normally distributed samples can be 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:

$\mu = 237, \sigma = 54$