Question 608095
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Hi
length is three inches more than it's width. 
Let x and (x+3)represent the width and length respectively
Question states***
If The length is incresed by one while the width stays the same, the area is increased by 13 square inches
 x(x+3)+13 = x(x+4)  this is the Set-Up
   13 = x, the width, original length is 16in