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A 2 x 4 is piece of lumber typically used in framing houses. A 2 x 4 actually measures 1-1/2" x 3-1/2" - as the wood dries it shrinks until it reaches this nominal size. Typically lengths for 2x4s are 8' and 12'. This lumber is typically made from a soft wood, like pine. When used as the verticals of framed walls, they are called "studs".
The weight of two math books depends on which books you are usingIf your using two "Saxon" 7/8, Pre- Algebra, Algebra 1, or Algebra 2 books the weight is about 11 pounds :)
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To build a 16 x 16 x 8 room, you need to calculate the lumber for the walls and the ceiling. The walls consist of four sides, each 16 feet long and 8 feet high, totaling 512 square feet of wall area. For the ceiling, you need an additional 256 square feet of lumber. Depending on the framing style and the number of windows and doors, you may require additional lumber for studs, plates, and other structural elements.