Question 148067
The problem provides the following equation:
s(t)=-16t^2+75t+407
.
They want to know the time(s) that the ball will be 450 ft high -- so, s(t)=450
.
So, now we have:
450=-16t^2+75t+407
Now, we solve for 't'.
.
450=-16t^2+75t+407
0=-16t^2+75t-43
.
Solving with the "quadratic equation" we get two solutions:
0.7 secs and at 4.0 secs

*[invoke quadratic "x", -16, 75, -43 ]