Question

36 - f - f - f- f = 0 write a division sentence for this repeated subtraction sentence

Answer 1

36 - f - f - f - f = 0 can be represented as;
$36 + (- f - f - f - f) = 0\\ 36 + (-4f)=0$

From here you can solve if you need:
$36 -4f=0\\ -4f=-36\\ f=\frac{-36}{-4}=9$