Suppose soda is on sale for $0.50 a can, and you have a coupon for $0.80 off your total purchase. Write a function rule for the cost of n cans of soda.
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The function rule for the cost of n cans of soda can be determined by subtracting the coupon amount from the cost of each can and then multiplying it by the number of cans.
The cost of n cans of soda = (cost per can - coupon amount) * number of cans
In this case, the cost per can is $0.50 and the coupon amount is $0.80.
Therefore, the function rule for the cost of n cans of soda is:
Cost(n) = ($0.50 - $0.80) * n