Algebra question i appreciate any !

Combine the information in the problem and the chart using the average balance method to solve the problem.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

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.