To find the number of cookies Keisha has left after eating 9, subtract 9 from the total number she baked, represented by c, resulting in the expression c - 9.
Keisha baked c cookies and ate 9 of them. To represent how many cookies she would have left, you simply subtract the number of cookies eaten from the total number she made.
So the expression to represent the remaining cookies would be:
c - 9
This means if Keisha started with c cookies and ate 9, she has c minus 9 left. It's a straightforward subtraction expression where c represents the initial number of cookies she baked.
The final answer for the number of cookies she has left is c - 9.