To join Karate Klub, David must pay a monthly fee of $25 and an initial fee of
$200. If he chooses Kool Karate, he must
pay an initial fee of only $100 but
$35/month.
a) After how many months is the cost the
same at either karate club?
b) If David plans to try karate for
6 months, which club should he join?
c) If David decides to do karate for a year,
which club should he join?

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.