1+1 my little brother wants to know this and I’m not aloud to tell him

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?

In parallelogram abcd the ratio of ab to bcis 5: 3. if the perimeter of abcd is 32 find ab

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.