Enter all responses using the Graphical Equation Editor…

     Enter all responses using the Graphical Equation Editor. An open box will be made by cutting a square from each corner of a 3-ft by 3-ft piece of cardboard and then folding up the sides.  What is the length of the side of the square that is cut from each corner that maximizes the volume of the box.? What is the equation that relates the variables? What is the derivative of this equation with respect to time? Solve for the answer to the question.