3x = 3 x 6 should be the equation because 3 x x is 3 x 6
Answer: Any x-values greater than 3
Explanation:

Answer:
Cu ---> Oxidized, HNO3 ---> Reduced.
Explanation:
Refer to attachment.
Copper (Cu) is gaining oxygen, hence, it's oxidized. On the other hand, HNO3 is losing hydrogen, hence, it's reduced.
<em>Hope</em><em> </em><em>it</em><em> </em><em>helps</em><em> </em><em>:</em><em>)</em>