Can you help me with this please I really need it: What was the most significant development during the time after Euclid? Who were the major mathematicians during this time, and what where their contributions?

Fabricating sheet metal The open tray shown in the illustration is to be manufactured from a 12-by-14-inch rectangular sheet of metal by cutting squares from each corner and folding up the sides. If the volume of the tray is to be 160 cubic inches and x is to be an integer, what size squares should be cut from each corner?

In each of the following problems, refer to the corresponding figure. Write an equation, solve for x, and check. All dimensions are in inches.