Which phrase describes an unknown or changeable quantity? A. 2 times the number of pages in the book
B. 60 seconds multiplied by 5
C. 3 dollars and 76 cents
D. 15 years of schooling

Which inequalities can be used to find the solution set of the following inequality? check all that apply. |2x – 5| (2x – 5) (2x + 5) –(2x – 5) –(2x + 5)

Tom drove 206 miles in 3.9 hours. estimate his average speed.

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?