Plug in f(t) = 0. We do this because f(t) represents the height and a height of 0 means you're at the ground.
f(t) =-5t^2 + 20t + 60
0 = -5t^2 + 20t + 60
-5t^2 + 20t + 60 = 0
Now solve for t using the quadratic formula
Answer
x < 9
Step-by-step explanation:
term , will be moved to the right side.
Notice that a term changes sign when it 'moves' from one side of the inequality to the other.
Answer:
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Step-by-step explanation: