Question

7. Suppose yogurt is on sale for $0.50 a piece, and you have a coupon for $0.30 off your total purchase. Write a function rule for the cost of n yogurts. How much would 20 yogurts cost?

Answer 1

the answer is a actually C(n) =0.5n-3 ; $9.70 and an equation for 20 yogurts is 20(n)=c50-30 i did this once and my answer was similiar to this.

Answer 2

Well, to find the cost of yogurts, you would use
N = Y$0.50 - $0.30
(The cost of yogurts is the price of yogurts times the amount you bought, minus the $0.30 from the total)
If you bought 20, it would be:
0.5 x 20 = 10 10 - 0.3 = $9.70
The answer is the first one, hope this helps :)