Juan's cat weighed 3.2 pounds last year. The cat grew and now weighs 7.1 pounds. Solve the equation 3.2 + w = 7.1 to find out how much weight Juan's cat gained.

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?