Play area can be determined using the formula
f=4Va+9-16, where f represents the feet of
fencing and a represents the area. If Highwoods
Park has 420 feet of fencing, what is the number
of square feet that can be enclosed for the
children's play area?
A. 11,872 square feet
B. 1.44 square feet
C. 10,192 square feet
D. 66.85 square feet