How many square feet are in a treatment area that is 40 feet wide by 60 feet long?

To determine the area of a treatment space, you multiply the width by the length of the area. In this question, the treatment area has a width of 40 feet and a length of 60 feet. The calculation is simple:

40 feet (width) multiplied by 60 feet (length) equals 2400 square feet.

Therefore, the correct result from the multiplication provides the total square footage of the treatment area as 2400 square feet.

This means that the choice indicating 3600 square feet would be incorrect, as it does not correspond to the calculated area based on the provided dimensions. Other options also do not align with this straightforward multiplication, reinforcing that the only valid correct area for the dimensions given is indeed 2400 square feet.