What is the area in square feet of a floor measuring 42 feet wide and 75 feet long?

To find the area of a rectangular floor, the formula used is length multiplied by width. In this case, the floor measures 42 feet in width and 75 feet in length. By applying the formula:

Area = Length × Width

Area = 75 feet × 42 feet

Performing the multiplication:

Area = 3150 square feet

Thus, the correct calculation confirms that the area of the floor is indeed 3150 square feet. The other options presented do not match this calculation, indicating they do not represent the correct area for the dimensions given. Understanding this standard formula for area is essential in various applications, including construction and architecture, where accurate dimensions are crucial.