What is g(21) equal to?

g(t) = t-6/3

g(21) = [1]

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.

For how answer my question this will be the last question can you answer in math subject

Solve -.016x= -16. need solving this