book Maths Puzzle Numerical Ability

I have tried everything i know to solve this problem but i cannot answer the problem correctly please help :
8f-3(f+6)=2f-16

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book Other Question

express the logarithm in terms of log2 M and log2 N: log2 (M/N)^4 Please help me on this problem. I don't even know where to begin.

It wants me to combine radical expressions if possible.

((((200)))-3(((8y)))I hope how I wrote it is correc