Karen spent $15.13 on clothes and $8.25 on food during her shopping day. If she gave the clerk $30.00, how much did she get back?

What is the sum of the geometric series in which a1 = 7, r = 3, and an = 1,701? hint: cap s sub n equals start fraction a sub one left parenthesis one minus r to the power of n end power right parenthesis over one minus r end fraction comma r ≠ 1, where a1 is the first term and r is the common ratio