Answer:
U need to use the axioms ig. For this you can use A. S. A. Draw two boxes and prove it
You are adding s^2 to your 128 ft^2. s^2 is a common representation of a square. So you could think of it as adding an area of a square of side "s" to your deck.
So one way of drawing it is to draw a rectangle with area 128 ft^2 and attaching a square to one of its side. The square that is attached has a side lenght of "s."
T=65$+(65$*.06)
T=65$+3.9$
T=68.9$