By number, rank the following four choices by their R-value from least to greatest: 1) 4-inch thick brick, 2) Half-inch thick drywall, 3) One eighth inch thick flat glass, 4) 3.5 inch thick stagnant air space.
✔️Answer:4, 2, 3, 1
🚀
Take Your Prep to the Next Level
Practice with interactive modes, adaptive testing, and detailed stats on our main app.