## bubbyv13 one year ago a foul tip of a baseball is hit straight upward. The function s(t) = -16t^2 +96t+4 describes the ball's height above the ground, s(t), in feet, t seconds after it was hit. Let s'(t)= -32t +96. Use the quadratic formula to determine how many seconds it will take for the ball to hit the ground.

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1. Euler271

s(t) is the height above the ground. you want to find the t values which make s(t) = 0. s'(t) seems unnecessary for this problem. quadratic formula for $at^{2} + b{t} + c$ t = $\frac{ -b \pm \sqrt{b^{2} - 4ac} }{ 2a }$

2. Euler271

it should say: quadratic formula for $at^{2} + bt +c = 0$ let me know if you have questions about what i said