In triangle ABC, angle C is a right angle. Find the value of the trig function. Find the cos(A) if c = 15, a = 9, b = 12

Ricky takes out a $31,800 student loan to pay his expenses while he is in college. after graduation, he will begin making payments of $190.66 per month for the next 30 years to pay off the loan. how much more will ricky end up paying for the loan than the original value of $31,800? ricky will end up paying $ more than he borrowed to pay off the loan.