Silvi has a coupon for $5 off any one item at her favorite store. She must pay 6% sales tax on the discounted Which of the following functions represents Silvi's final cost, c, for an item with an original price of z dollars? A B C D O A OB c(z) = 0.94 - 5 c(z) 0.94 (x - 5) c(z) = 1.062 - 5 c(z) = 1.06 (z - 5)​