I have linked a picture with the intervel.
Answer:
22 units
Step-by-step explanation:
Add 12, 4 , and 6 and you will get 22
Area = length * width for a rectangle or square
Total area = (t+5)(t+3)
the rest of the areas can be seen here
http://prntscr.com/dc7jdg
y+2=-3x+12
-2 -2
y=-3x+10
This is as far as it can be simplified.
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hope it helps