A photocopy machine can copy 42 pages every two minutes. How many pages can it photocopy in 5 minutes?

Answer choices
4.2
420
105
21

Standard deviation is best described as

A. the difference between the number and the mean.

B.the sum of the differences between the numbers and the mean.

C. the square root of the sum of the differences between the numbers and the mean squared and divided by the number of terms.

D.the square root of the mean divided by the Z-Score times the sum of the numbers.

Step-by-step explanation:

answer: a

step-by-step explanation:

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt