Doubt from current electricity

Question no 8 and 9

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8 is b

Yes but how i got confused and what you have written in post 2 i can't understand

Don't mind post 2 and use R=pL/A where A=πr²

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In 9 also use same formula but density =m/V or V=A.(length) and write A=m/d.(length) and use formula R=pl/A you will get your answer

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Is there any mnemonics for remembering colour coding for resistances

Is exanple 13 done wrong i am getting answer as 5/10^4 A not 0.5/10^4