Geometry correct errors please help asap!!

Carl wants to buy a television that cost $500 including taxes. to pay for television he will use a payment plan that requires him to make a down payment of $125 and then pay $70.50 each month for six months what is the percent increase from the original cast of the television to the cost of the television using a payment plan.

6.3x+14 and 1.5x-6 answer in simplified form

2÷6+1/2 to the second power plus one