Answer is needed however explanation is needed more..​

Find a number such that if you add 8 and divide the result by 4 you will get the same answer as if you subtracted 3 from the original number and divided by 2

Ahigh definition tv cost $800 with a down payment of 2/5 of the cost. how much is left to pay, in dollars after the down payment has been made?

Segment xy is dilated through point m with a scale factor of 2. which segment shows the correct result of the dilation