Since no interest is charged on any loan paid fully within 14months, if Denise got a loan of $6500 to buy a car, then denise must pay in less than 14months in order for him not to be charged interest.
Assuming Denise paid all the loan within 13months, then for him not to be charged any interest on loan, he must he able to pay at least $6500/13 which is equivalent to $500 every month.
the question states if necessary, round the nearest tenth and by using the pythagoras theorem the answer should be 10 since its 9.21 and its nearest 10th is 10? im not quite sure though
I hope this helps, I tried to make my handwriting as easy to read and to explain as much, I just used a calculator to compute all those values to find AC