Charlene makes $10 per hour babysitting and $5 per hour gardening. she wants to make at least $80 a week, but can work no more than 12 hours a week. write and graph a system of linear equations.

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.