As we could "drag" these together, we could then do it the easy way.
56
+56
+56
-------
168
------------------------
Or we could also do the following:
56

3:
6

3= 18.
Carry the one.
5

3 = 15+1 (which was carried). = 16
(16+8) =
168
Answer:
C
Step-by-step explanation:
The range is the grade. Domain is the amount of hours that you study for.
If I am understanding the question, and assuming the living room is a rectangle, then the border should be 80 ft