part a
To solve an inequality for a variable we need to isolate it on the left side. The first step to do this is adding "100" on both sides.
Now we need to divide both sides by "k", in order to isolate the "m".
Now we have to multiply both sides by "-1", by doing so we also need to change the inequality from ">" to "<".
part b.
We need to solve the expression below for "f":
We need to isolate the "f" variable on the left side. The first step is to change the "2c" from the left to the right, we do that by subtracting "-2c" on both sides of the equation.
Then we need to divide by "-8" on both sides.