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.