The answer is d x-7 because it's seven less than a number
Each classroom donated around 320 cans(or more) of food.
320x28=8,960.
Here is the answer from SparkNotes
http://www.sparknotes.com/math/algebra2/operationsonfunctions/section3.rhtml
(14)(6)=84 (base)(height)
In exact form it would be 15/8
