<PRE><B>Question 1134634</B>
450 feet of fencing indicates that the perimeter = 450ft

l = length
w = width

Perimeter = (l+w)*2 = 450
Area = lw = 8750

l = 8750/w

{{{8750/w +w)2 = 450}}}
{{{8750/w + w) = 225}}}
{{{8750 + w^2 = 225w}}}
{{{w^2-225w+ 8750 = 0}}}
{{{(w-50)(w-175)=0}}}

{{{w=50ft or 175ft}}}
In other words, 
{{{l=175ft or 50ft}}}

The dimensions that she should use = 50ft by 175ft.




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