A library building is in the shape of a rectangle. Its floor has a length of (3x 5) meters and a width of (5x − 1) meters: (3x 5)(5x − 1) Which of the following simplified expressions represents the area of the floor of the library building in square meters? 28x − 5 15x2 − 5 15x2 28x − 5 15x2 22x − 5.