After how many seconds does the cannon ball splash into the water?

The height of a cannon ball, in feet, shot from a pirate ship is given by the equation h = —0.03x2 + 84x + 20, where x is given in seconds. After how many seconds does the cannon ball splash into the water?

a) —6.58 sec

b) 25 sec

c) 33 sec

d) 21 sec

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