Answer:
Step-by-step explanation:

21 has no 2 in it's prime factorization. So it can never end in 0, 2 , 4 , 6 , 8.
OR
Odd number raise to any number is always odd, Which does not include 2, 4, 6 , 8.
So
does not end with 0, 2, 4 , 6 , 8.
Answer: i.. do.... not... know..
Step-by-step explanation:

The graph of the equation is attached in the figure below
Step-by-step explanation:
We need to make the graph of the equation: 
Solving the equation:

Applying absolute rule: |u|<a, a>0 then -a<u<a
So,

The graph of the equation is attached in the figure below.
Keywords: Solving inequalities by Graphs
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