Alain throws a stone off a bridge into a river below. The stone's height (in meters above the water), xxx seconds after Alain threw it, is modeled by:
h(x)=−5x^2+10x+15
what is the height of the stone at the time it is thrown?

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation:

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed

simplified/solved

anwser:

-80x^2+158x+158

answer is c 52. hope you got it down bud. : d