Answer:
1. area of new pen = 11 1/4 ft^2
2. i. 5 feet by 2 1/4 feet
ii. 2 ½ feet by 4 ½ feet
Step-by-step explanation:
The size of the pen as planned = 5 ft long by 4 ½ ft wide
Area of the pen = length x width
             = 5 x 4 ½
             = 5 x 9/2
Area of the pen = 45/2
             = 22 ½ ft^2
But, Krista has to make the pen ½ the size of planned. So that; area of new pen = ½ x 22 ½
    = ½ x 45/2
    = 45/4
    = 11 1/4
area of new pen = 11 1/4 ft^2
The area of the new pen would be 11 1/4 ft^2.
The possible values she could use are:
i. 5 feet by 2 1/4 feet
ii. 2 ½ feet by 4 ½ feet
