Question: Here's the question if you can please explain in full. Couldn't wrap my head around this hw question need help thank you 2. The height

Here's the question if you can please explain in full. Couldn't wrap my head around this hw question need help thank you

2. The height of a cannon ball, h meters, / seconds, after it has been shot out of a cannon is given by the formula h(r) = -12 + 20r - 5r. Firstly i'd like to know the maximum height of the cannonball and How long does it take the cannon ball to reach its maximum height. Also How long does it take the cannon ball to reach the ground and What is the initial height of the cannon ball when it is shot out of the cannon

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