I’m having trouble finding the answers to this problem

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.

What value of x is in the solution set of 4x – 12 s 16 + 8x?

Y=(x+3)(x-4)(x+1)^2 sulutions? multiplicity?