Suppose stockings are on sale for $9.00 each, and you have a coupon for $4.00 off your total purchase. Write a function rule for the cost of n stockings.
Let's define the function C(n) as the cost of n stockings.
We know that each stocking costs $9.00 and, since there is a coupon for $4.00 off the total purchase, the discounted price for each stocking is $9.00 - $4.00 = $<<9-4=5.00>>5.00.
Since we want to find the cost of n stockings, we can use the equation:
C(n) = 5.00n
Therefore, the function rule for the cost of n stockings is C(n) = 5.00n.