3.556 is the correct answer
The expression (n+3) represents the measure of an exterior angle of a regular octadecagonal.
Add 4/5 and 1/5 to make 5/5 or 1 mile the subtract 1 from 2 1/2 to equal 1 1/2 miles
Garden area = length*width
.. = (12.5 ft)*(10 ft)
.. = 125 ft^2
Vegetable area = (1/2)*Garden area
.. = (1/2)*125 ft^2
.. = 62.5 ft^2
The area of Roberto's vegetable garden is 62.5 ft^2.
