Need help solving these, moth preferably with an explaination how to do so

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

In the diagram below, abc is congruent to dec what is the value of x

Margaret is purchasing a house for $210,000 with a 15 year fixed rate mortgage at 4.75% interest she has made a 5% down payment the house is valued at 205,000 and the local tax rate is 3.5% homeowners insurance 600 per year what are her total monthly payment