Silvi hasa coupon for $5 off any one item at her favorite store. She must pay 6% sales tax on the discounted prico Which of the following functions represents Silvi's final cost, C, for an item with an original price of x dollars?
Oc(x) 0,94 (x - 5)
Ox)=0.94x-5
O(x) = 1.06 (x - 5)
O c(x)= 1.06x -5

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Rewrite so the subject can be y in the formula d=m-y/y+n