Help someone out real quick (free brainlist/thanks/5star

If g^-1(x) is the inverse of g (x) which statement must be true

Which graph has a rate of change of zero

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