Question

You have $40 in a savings account and you deposit an equal amount into your account each week. after 8 weeks the account holds $128. write an equation that represents the amount yy (in dollars) of money in the account after xx weeks.

Answer 1

40×x^8=128
x^8=128÷40
x^8=3.2
X=1.156494986 (8th root of 3.2)

40×1.156494986^xx=yy