Area of the base is 100 square feet and the height is 30 find the volume

The equation for volume is

v = length * width * height

the equation for the area of a square is

a = length * width

since length * width is in the top equation we can replace it with area like this

v = (length * width) * height

v = (area) * height

v = 100 * 30

v = 3000 ft^3