F(x) = x+3/x find inverse

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 is the simplified expression for 6(2(y+x))

What could explain what happened when the time was equal to 120 minutes