Which of the following is an example of a rational function?

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

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

Grace paid $1.70 for 5 ounces of candy. how much did she pay for 24 ounces?