Find the аverаge fоr the fоllоwing sets of numbers. Round to the neаrest whole number. The R-value of blown fiberglass is 2.2 per inch of depth. The R-value of blown cellulose is 3.7 per inch. What is the total difference in the R-value of the two materials for 12 inches of blown-in insulation? If 14-gauge Romex cable sells for $0.19 per foot, what is the cost of 1210 ft of this cable?