You need to learn how to do these. I can help but the most help is by practice. In a, V goes from +4 on the lef to +3 on the right.
Here is a good site on redox including how to balance acidic and basic reactions.
http://www.chemteam.info/Redox/Redox.html
Balance the following half-reactions:
(a) (acidic) VO2+ (aq) -------V3+ (aq)
(b) (basic Ni(OH)2 (s)--------Ni2O3 (s)
(c) (acidic) NO3- (aq)-------NO2 (aq)
(d) (basic) Br2 (aq)----------BrO3- (aq)
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