Bailee plots two points on the coordinate grid. She put point J at (3,9) and (8,2)

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!