If the total area of the rectangle below is $168$ square units, how long is each side? To find out how long the $x$ side must be, copy the diagram and table and answer the questions that follow.  

Describe/Draw:

Declare:

1. Describe how the lengths of the two sides are related to each other.

   Hint (a):

   Identify which side is longer and which is shorter. Label the value of the lengths of each side. Can you find a relationship between these values?

   	top edge$x+2$
   left edge$x$	rectangle interior is blank	right edge$\boldsymbol{x}$
   	bottom edge$\boldsymbol{x+2}$

2. Which side of the rectangle does Side #2 represent?

   Hint (b):

   By looking at the side lengths in the chart, we see that Side #2 is greater than Side #1.

   Answer (b):

   Side #2 represents the $x+2$ side of the tile shape.

3. Use the 5-D Process to complete the table. Find the lengths of the two sides of the rectangle.

   Answer (c):

   	Define		Do	Decide
   	Side #1	Side #2	(Side one) · (Side two)	Area = 168?
   Trial 1:	$10$	$12$	$\mathbf{(10)(12)=120}$	Too Low
   Trial 2:	$\mathbf{12}$	$\mathbf{14}$	$\mathbf{(12)(14)=168}$	Yes, this must be the correct answer.