Answer: not sure what you were trying to ask but two less than 15 is 13.
Answer:
KEYS is a square
Showing as plotted and connected points
See the attached
The answer is 60.7 because 90-29.3=60.7
The statement is always true because right angles measure 90 degrees and if you add them you get 180 and supplementary angles are angles that add up to 180.
Hope this helps :)