Question

A rectangle has a perimeter of 20m, express the area of the rect. as a function. of the length of one of its side?

Answer 1

\[\large \bf Area~of~Rectangle=length \times breadth\]
\[\large \bf 20=l \times b\]
where,l=length and b=breadth.
So,function of l :-
\[\large \bf \frac{20}{b}=l\]

Answer 2

understood? @briah123

Answer 3

A plot and solution calculated and plotted with Mathematica 9 is attached.
This version has the proper line numbering and thank you for the medal.