Which is a rational function?
A. Y=x-5/2
B. y=x^2-x+ 4
c. y=2^x
D. y=x-3/x^2

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