The number of gallons of gasoline used varies directly with the number of miles driven. If 45 gallons of gasoline have been used after driving 625 miles, how
many gallons would be used after driving 900 miles? *

Asales representative from a local radio station is trying to convince the owner of a small fitness club to advertise on her station. the representative says that if the owner begins advertising on the station today, the club's total number of members will grow exponentially each month. she uses the given expression to model the number of club members, in hundreds, after advertising for t months.