Question is in the picture

When only separate discreet points are graphed it is called?

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.

Find the missing factor. write your answer inexponential form.9^2=9^4×