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Volume of a rectangular prism = length x width x height
Given that the height is 12 ft and the volume of the sandbox is at least 42 ft^3:
42 ft^3 ≤ b x w x 12 ft
Divide by 12 ft on both sides:
3.5 ft ≤ b x w
Therefore, the inequality to express the possible area of the base, b, of the sandbox is:
3.5 ft ≤ b x w