Assume reinforced concrete weighs 150 lb/ft^3, plain concrete weighs 145 lb/ft^3, and soil weighs 100 lb/ft^3. The wall thickness is 14 inch, D is 15 k/ft, L is 12 k/ft, f'c is 4 ksi, fy is 60 ksi, qa is 3 ksf, distance from bottom of footing to final grade is 3 ft, h=15 inch footing, d=11.50 in. Design wall footings for the values given, the walls are to consist of reinforced concrete