I need help on these problems ASAP!!

If x = 12 and y = 3, what is the value of x - y 2? 81 6 3 18

If your annual gross income is $62,000 and you have one monthly car payment of $335 and a monthly student loan payment of $225, what is the maximum house payment you can afford. consider a standard 28% front-end ratio and a 36% back-end ratio. also, to complete your calculation, the annual property tax will be $3,600 and the annual homeowner's premium will be $360.

If square root x = -7, then x= -49 true or false