Given
40 feet of fencing
Equation
[tex]\begin{gathered} P=2w+2l \\ A=wl \end{gathered}[/tex]Table
w = 1 feet
l = 19 feet
A = 19 sq feet
w = 3 feet
l = 17 feet
A = 51 sq feet
w = 10 feet
l = 10 feet
A = 100 sq feet
w = 15 feet
l = 5 feet
A = 75 sq feet
Equation
x = width
A = w*l
l = A/w
40 = 2w + 2l
l = 20 - w
[tex]-x^2+20x[/tex]