Which phrase describes an unknown changeable quantity

Question

A. 15 years of schooling
B. 3 dollars and 76 cents
C. 2 times the number of pages in the book
D. 60 seconds multiplied by 5

Answer 1

The phrase that describes an unknown changeable quantity is:

C. 2 times the number of pages in the book

This is because the number of pages in the book is unknown and can vary, making it a changeable quantity.