Math how can you find the maturity value after t years or the balance at the end of year in an account that uses simple interest

Bob’s bank charges him a $3.15 service fee every time he uses an out-of-network atm. if bob uses an out-of-network atm an average of three times every two weeks, how much will he pay in service fees over the course of a year? a. $327.60 b. $109.20 c. $491.40 d. $245.70 select the best answer from the choices provided a b c d

Which of the following is true for the relation f(x)=2x^2+1

If y varies directly as x2 and y=6 when x=6, find the constant of variation.