Can u plz help me with this

Carl wants to buy a television that cost $500 including taxes. to pay for television he will use a payment plan that requires him to make a down payment of $125 and then pay $70.50 each month for six months what is the percent increase from the original cast of the television to the cost of the television using a payment plan.

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

Sketch one cycle if the cosine function y=2cos2theta