For this case we will pose an equation according to the amount of cookies left after Anna ate 8.
So:
If I bake 3 batches of cookies and each batche had "c" cookies, then we have: [tex]3c[/tex].
IF Anna ate 8 we have:
[tex]3c-8[/tex]
Thus, equation 3c-8 represents the amount of cookies left after Anna ate 8.
ANswer:
[tex]3c-8[/tex]
