Which phrase describes an unknown or changeable quantity? a. 15 years of schooling b. 60 seconds multiplied by 5 c. 2 times the number of pages in the book d. 3 dollars and 76 cents

Hello!

An unknown or changeable quantity is a variable. We can write these expressions below and see which one has a variable.

A. 15

B. 60(5)

C. 2p

D. $3.76

As you can see, we do not know how many pages are in the book. Therefore, our answer is C.

I hope this helps!

the least common denominator is 40