Comparar as seguintes pares de fraccao

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 20+(5 x 2/5 )+ 3 show your work

How can you tell when x and y are not directly proportional?