The fish tank in paul's bedroom has a pump that will recirculate 75 gallons of water in 1/4 of an hour. find the unit rate in gallons per hour. a. 5 gallons per hour b. 18.75 gallons per hour c. 300 gallons per hour d. 187.5 gallons per hour

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?