Jack needs 72 feet of fencing.
You had to do 4 ft x 18 ft which would give you the answer of 72. To find the area of a rectangle you do length x width.
He's going to put fence around the garden. This means that they question is asking for the perimeter (which is length + length + width + width) so the perimeter is 18 + 18 + 4 + 4, or 44ft of fencing
