Translate the phrase into a variable expression. Use the letter a to name the variable. If necessary, use the asterisk (*) for multiplication and the slash
(/) for division.
... the product of 20 and the number of apples...

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