I need help ASAP. Thank you.

F(n + 1) = f(n) – 8. if f(1) = 100, what is f(6)?

Find the solution of this system of equation -7x+y=-20 9x-3y=36

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.