<PRE><B>Question 298521</B>
so let l = length and w = width

we know the l = w + 4 and we know that 2l + 2w = 48
so use substitution:

2(w+4) + 2w = 48
2w + 8 + 2w = 48
4w + 8 = 48  subtract 8 from both sides
4w = 40  divide by 4
w = 10

now go back and sub 10 in for w
l = 10 + 4 
l = 14

Now area is w x l

so 10 x 14 = area
   10 x 14 = 140 square inches

Hope this helps</PRE>