Need help finding n and m

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

Acaterpillar eats 1400\%1400% of its birth mass in one day. the caterpillar's birth mass is mm grams. which of the following expressions could represent the amount, in grams, the caterpillar eats in one day? \