Question: The equation y = - 1 6 t ^ ( 2 ) + 4 0 t + 9 represents the height of a projectile, y

The equation
y=-16t^(2)+40t+9 represents the height of a projectile, y, in feet at a particular time t, in seconds
For what interval (or intervals) of time will the projectile's height be over 25 feet?

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