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At time t = 0, a projectile was fired upward from an initial height of ... ...

At time t = 0, a projectile was fired upward from an initial height of 10 feet. Its height after t seconds is given by the function h(t) = p − 10(q − t)², where p and q are positive constants. If the projectile reached a maximum height of 100 feet when t = 3, then what was the height, in feet, of the projectile when t = 4 ?