The total surface area of this cuboid is 112cm^2. Find the value of x.

Perry observes the opposite parallel walls of a room in how many lines do the plains containing the walls intersect

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.

Aconstruction worker needs to put a rectangular window in the side of a building he knows from measuring that the top and bottom of the window have a width of 8bfeet and the sides have a length of 15 feet he also measured one diagonal to be 17 feet what is the length of the other diagonal