PLS HELP!!! Cirumference math

What is the value of 1/3× + 7x, when x =5

Which of the following graphs represents the function f(x) = 2^x

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.