Split 500 three ways​

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)

Adan has decided to purchase an $9000 car. he plans on putting 20% down toward the purchase and financing the rest at 7.9% interest rate for 3 years. find his monthly payment a) $225.29 b) $298.81 c) $204.78 d) $236.89

15. if the 8% tax on an item amounts to $0.96, what is the final price (tax included) of the item?