Maths Puzzle Trigonometry

I have 90 degree triangle with two sides known how do I get the height of the triangle?

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Consider the general quadratic function f(x) = a(x-h)^2 + k, where a, h and k are real constants and (a) does not equal 0. Where does the graph of f(x) cross the y-axis? And if the vertex of the graph of f(x) is located at the point (2,3), how many x-intercepts are possible for the graph? Given C(x)=24.41x + 122 and R(x)=27x, what is the marginal cost and the marginal revenue?