Shawn bought $40 worth of gas for his car. When he bought the gas, he only had $34.50 in his bank account, so he paid a penalty fee. Did Shawn use a debit card or credit card to pay for the gas?

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.