Which of the following relations is a function? A {(-5,5), (0, 3), (0, -5), (5,4)}
B (3, 4), (3,5), (3, 6), (3,7)
C {(-2, 1), (0, 1), (2,5), (4,5)}
D {(3, 2), (5,4), (5, 6), (7, 8)}

Joel wants to buy a new tablet computer fram a store having a 20% off sale on all tablets. the tablet he wants has an original cost of $190. he also wants to make sure he has enough money to pay the 5% sales tax. part one joel uses the incorect expression 0.95(190)(0.8) to calculate that the tablet will cost him a total of $144.40. describe his error and write the correct expression part two how much will joel pay for the tablet show your work if you answer this question correctly you will receive a prize of 99 points good luck