A toy rocket is launched upward from a platform. Its height above the ground, in meters, after t seconds is modeled by
h(t)=−5t2+20t+15
For how many seconds is the rocket at a height of at least 30 meters?
A toy rocket is launched upward from a platform. Its height above the ground, in meters, after t seconds is modeled by
For how many seconds is the rocket at a height of at least 30 meters?