<PRE><B>Question 191400</B>
Start with an easier problem. Convert 1 square mile into 
square feet. I know that
1 mile = 5280 ft
A square that is 1 mile on each side is 5280 ft on each side
1 mile2 = {{{5280^2}}} ft2
Now I can multiply the ratio
{{{5280^2 / 1}}} ft2/mile2
by 7000 mile2, I get:
{{{5280^2 / 1}}} ft2/mile2 x {{{7000}}} mile2
Notice that the mile2 cancel, and you are left with ft2
Now just do the calculation </PRE>