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In the meantime, who's up for a puzzle?

Three points of a perabola are as follows: \((-2, 20)\) \((-1, 18)\) \((0, 20)\) The quadratic for this line can be written as \(ax^2 + bx + c\), where \(a\), \(b\) and \(c\) are constants to be found. \(n = c^a + b\)