How many solutions does (x+7)=0 have

Lines p and q intersect. find the value of b. show your work. cite any theorems you use.

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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.