Answer:
The answer is 28/9
Step-by-step explanation:
Step one
Given information
We are given that the function is

And we are expected to find f(6), that is substitute the value of x with 6
Step two:

A. You divide 1 (infront of x) by 12 to get 12. You divide -6 by 12 to get -2 for the y intercept.
The unit price is 90 cents per can of tomato sauce.
Divide the paper which is 21 inches (12+9) by 1.5 and you have your answer which is 14