Suppose b= 2a-16 and b= a+2. what is the value of a?

Asap! i'm not good math and i'm lost.

Which expression is rational? 6. , square root two, square root 14, square root 49

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