8. p+(-2.1) for p = 1.8
9. - 1/3 + s for s= -4 1 / 2
11.-3.5 - 11.6
12. 2.54 -5.54
14. 2 - x for x=5 2/5
15. 6) for k= 5.9

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?