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The formula to calculate the volume of a rectangular pyramid is:
Volume = (1/3) * (base area) * height
First, calculate the base area of the pyramid:
Base Area = length * width
Base Area = 8 mm * 5 mm
Base Area = 40 mm^2
Now, substitute the values into the volume formula:
Volume = (1/3) * 40 mm^2 * 18 mm
Volume = (1/3) * 720 mm^3
Volume = 240 mm^3
Therefore, the volume of the rectangular pyramid is 240 cubic millimeters.