There is a sales tax of $5 on an item that costs $63 before tax. a second item costs $50.40 before tax. what is the sales tax on the second item?

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