A blackboard has an area of 28 ft2 and a perimeter of 22 ft. What are the dimensions of the board?

For a rectangle, the area is length × width and the perimeter is 2(length + width). A board measuring 4 ft by 7 ft has area 4 × 7 = 28 ft² and perimeter 2(4 + 7) = 22 ft. So the dimensions are 4 ft by 7 ft, choice C.

AI-written and checked against the verified answer.