Customers at a gym pay a membership fee to join and then a fee for each class they attend. Here is a graph
that represents the scenario.
Write an equation for the cost in dollars, c, of attending
n classes.

Abank manager wants to encourage new customers to open accounts with principals of at least $2 comma 500. he decides to make a poster advertising a simple interest rate of 3%. what must the principal be if the bank manager also wants to advertise that one can earn $10 the first month? can the poster correctly say, "open an account of $2 comma 500 and earn at least $10 interest in 1 month! "?