Question

Which phrase describes an unknown or changeable quantity?

a. 60 seconds multiplied by 5
b. 3 dollars and 76 cents
c. 2 times the number of pages in a book
d. 15 years of schooling

Answer 1

c. 2 times the number of pages in a book.

Explanation:

this would be represented by 2n.

We do not know how many pages there are.