Please help! This is hard for me to figure out! :(

What could explain what happened when the time was equal to 120 minutes

Describe how making an ‘and’ compound sentence effects your solution set

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.