We are only told that the maximum height is 4 feet for the water fountain so we know that the vertex is (0,4). We think we would use the formula y=a(x-h)^2-k, but we do not know what to put in for x or y.
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1Can you please include the complete context of the problem along with your efforts.. – sai-kartik May 29 '20 at 17:54
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What is h and what is k? – Moti May 29 '20 at 20:27