Answer:
The answer is A
Step-by-step explanation:
Answer:
500=120+60
Variable would either be M or D For 60
Step-by-step explanation:
Answer:
Given that:
and 
if a , a+ commutator, it obeys 
First find:

= 
Now;

=
therefore,
which implies the operators a and a+ are commutators.
Answer:
7l=2l+r
Step-by-Step explanation: