Mindy and troy combined ate 9 pieces of the wedding cake. mindy ate 3 pieces of cake and troy had 1/4 of the total cake.. write an equation to determine how many pieces of cake (c) there were in total.

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?