P-S A rectangle is made from two identical squares.
Each square has an unknown side length.
a. Write an expression for the area of the rectangle.
b. Write an expression for the perimeter of the rectangle.
c. The rectangle is the cross section of a cuboid.
The cuboid has a depth that is 3 times the length of the square.
Write an expression for the volume of the cuboid. (Please answer all with explanation if possible)