Answer:
The perimeter is decreased by 4.
Explanation:
If the width of a rectangle with length of 5 and width of 4 is decreased by half, then the new width is 2. The new perimeter of the rectangle is calculated as follows:
old perimeter = 2*(length + width) = 2*(5+4) = 18
new perimeter = 2*(length + new width) = 2*(5+2) = 14
The difference between the old perimeter and the new perimeter is 18 - 14 = 4. Therefore, the answer is (E) The perimeter is decreased by 4.