Answer:
18 + 5f
Explanation:
To simplify the expression 6 + 9f + 5 + 4 + 3 - 4f, we must combine like-terms.
6 + 5 + 4 + 3 = 18 (6,5,4, and 3 are like-terms because they are all normal integers)
18 + 9f - 4f (9f and 4f are like-terms because they have the same variable f)
18 + 5f