. Using the high-low cost estimation technique and square feet as the independent variable, determine the cost of painting a 3,300- square-foot house with 14 external openings. Also determine the cost for a 2,400-square-foot house with 8 external openings. House Square Feet External Openings 1 2 3 4 5 6 7 8 9 10 11 12 2,500 3,010 2,800 2,850 4,600 2,700 2,600 2,550 2,600 3,700 2,650 3,550 13 15 12 12 19 13 11 11 10 16 13 16 Costs $2,810 3,742 3,100 3,150 4,700 3,225 2,920 2,836 3,242 4,112 3,210 3,965