If 25mm of drywall has an R value of 0.5 and fiberglass insulation has an R value of 5 per inch and plywood has an R value of 0.25. What is the R value
of the wall with 4 inches of insulation?

As a part of an experiment a student burns propane to produce carbon dioxide and water she remembers that she must follow the law conservation of matter when writing a balanced chemical equation which of these equation adheres to the law of conservation of matter

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

On the periodic table, elements are arranged by which of the following. a. mass numbers. b. increasing atomic number. c. alphabetical order. or d. density