Please can anyone solve me with the code. Can you write it digital

An open-top box is made by cutting out equal square corners of an 9 x 12 inch sheet of cardboard and folding up the flaps 1) Write and expand a formula V(x) for the volume of the box as a function of the length x of the squares. I 2) Find the volume when the squares are 2 1/8 inches to a side. 3) Find the length of the sides of the square required to get a volume of 50 cubic inches. 4) Plot a graph of V(x) in an appropriate practical domain