Answer:
Step-by-step explanation:
Given that A is a square matrix and A is idempotent

Consider I-A
i) 
It follows that I-A is also idempotent
ii) Consider the matrix 2A-I

So it follows that 2A-I matrix is its own inverse.
(m=n) means that the greatest common denominator of m and n is 0.
this is a whole number.
this is a integer.
this is not a rational or irrational.
if this is the wrong answer please notify me. thank you!
80 is correct.
-440+360 = 80