Cheddars favorite online dogfood retailor charges $8 per pound of food, $12 for flat rate shipping (on any size order), and there is a 9% tax that applies to both the price of food and the shipping price. Orders can be placed as few as 10 pounds, as much as 100 pounds, or any multiple of 5 pounds in between 10 and 100.

1) Let () be the subtotal, in dollars, when pounds of food are ordered. The subtotal () does not include the cost of shipping or tax. a. Give a function equation for (). b. Give the domain and range of () (include correct units). c. Find and interpret (45).