The volume (in cubic feet) of a black cherry tree can be modeled by the equation y = - 50.8 + 0.3x, +4.5x, where x, is the tree's height (in feet) and x, is the tree's diameter (in inches). Use the multiple regression equation to predict the y-value for the values of the independent variables. x, =70, x, -8.6 The predicted volume is cubic feet. (Round to one decimal place as needed.)

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