Suppose that z varies jointly with the cube of x and the square of y. Find the constant of proportionality k if z = 5600 when y = 4 and x = 5. %3D k = 2.8 Using the k from above write the variation equation in terms of x and y. 2.8a*y2 Z = 2.8x3, Using the k from above find z given that y = 7 and x = 13. %3D z = 2109998

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