The selling price of a car is $15,000. Each year, it loses 12% of its value. Which function gives the value of the car t years after its purchase?

Griffin ordered a pair of sneakers online. he had a $22 credit that he applied toward the purchase, and then he used a credit card to pay for the rest of the cost. if the shoes cost $58, how much did griffin charge to his credit card when he bought the sneakers?