Select the correct answer. What is a unit rate?

A.
a rate with one in the numerator
B.
a rate in which the numerator and the denominator are equal
C.
a rate with one in the denominator
D.
a rate in which the denominator is greater than the numerator

I would say C

Step-by-step explanation:

Because it usually means "per" which means how many it takes for 1. So if it has 1 in the denominator, it's a whole, or how many it takes to have 1.

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

5050

hope this !