Rachel and jeffry decided to start saving for college. rachel has $1,500 to start her savings account, and jeffery has $1,200. rachel’s bank offered her an interest rate of 7.5% compounded annually. jeffery decided to keep his money in a safe in his bedroom, and he adds $200 to his safe each year. suppose that a represents the accumulated money in each one’s savings fund and t represents the number of years. choose the equations that form the system that best models this situation. a) a = 200t + 1,200 b) a = 1,200(1.2)^t c) a = 7.5t + 1,500 d) a = 1,500(1.075)^t e) a = 1,200(1.075)^t