The function f(t)= -5t^2 + 20t + 60 models the approximate height of an object t seconds after it is launched. How many seconds does jt take the object to hit the ground?

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step-by-step explanation:

the answer is d on edge

step-by-step explanation:

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

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