Why didn’t the quarter roll down the hill with the nickel

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?

Astore sells two types of radios. one type sells $87 and the other for $119. if 25 were sold and the sales were $2495, how many of the $87 radios were sold a) 5 b) 20 c) 15 d)10

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36