Please help 7 grade math asap only worry about 11

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.

Solve 3x-18=2y and 5x-6y=6 by elimination show work

How do you write 600 as a product of its prime factors (index! )