The R-value of insulation can range from R3.14 per inch for some batt insulation to as high as ____ per inch for polyisocyanurate foam, but there are other factors to consider such as embodied energy and ease of installation.
A. R5.23
B. R6.78
C. R7.20
D. R8.15
Answer: C
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? Identify and state the historical significance of Jacob Riis.
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