"how many 2 foot square floor tiles are needed to cover the floor of a rectangular room 32 feet in length and 30 feet in width"

Your tiles are measured in area, so to do this you will want another area measurement.  Multiply the length of the room by the width (32 x 30) to get your area (960 square feet).  Divide your room area by your tile area to get the 960 / 2 = 480 tiles.

Yes; circles D and E have the same radius.

Step-by-step explanation: