The total number of cups of flour ( f. that mckenna has left after baking ( c. number of cakes is given by the equation f = –9c + 80 a. if mckenna bakes 3 cakes how much flour will she have left?

To find how much flour Makenna will have left, you will substitute (replace the letter c with the number of cakes she made.  The answer you get will be how much flour is left.

f = –9c + 80
f = -9(3) + 80
f = -27 + 80
f = 53 cups

Makenna will have 53 cups of flour left after baking 3 cakes.