A garden plot is bounded by 60 ft of fencing along three sides (the fourth side is a wall). Express the area as a function of the width w perpendicular to the wall.
A A(w) = w(60 − 2w)
B A(w) = w(60 − w)
C A(w) = 60w
D A(w) = (60 − w)²
Explanation
Length parallel to the wall = 60 − 2w. Area = w · (60 − 2w).