Cellulon, a manufacturer of home insulation, wants to develop guidelines for builders and consumers on how the thickness of the nsulation in the attic of a home and the outdoor temperature affect natural gas consumption. In the laboratory, it varied the insulation hickness and temperature. A few of the findings are: On the basis of the sample results, the regression equation is: y^=62.651.86x10.52x2 a. How much natural gas can homeowners expect to use per month if they install 6 inches of insulation and the outdoor temperature is 40 degrees F? (Round your answer to 2 decimal places.) b. What effect would installing 7 inches of insulation instead of 6 have on the monthly natural gas consumption (assuming the outdoor temperature rernains at 40 degrees F )? (Round your answers to 2 decimal places.) c. Why are the regression coefficients b1 and b2 negative? Is this logical