The answer to this question is 9
A square has 4 right angels and 4 sides with equal angels ;)
The increase of volume = volume of the cube = 1 cubic foot = 1728 cu ins
Area of the base = 12 sq ft = 12 * 144 = 1728 sq ins
The height of increase = 1728 / 1728 = 1 inch Answer
The equation equivalent to this formula would be D)b1=2A-b2