book Maths Puzzle Numerical Ability

log(x^2)=2logx This one is also true right? Thank you for you help.

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book Other Question

I have been working on this all day. could someone explain this problem to me i am working with adding and subtracting rational expressions with different denominators.

4x/2x^2 + x - 10 - 9x/x^2 + x - 6 1/2 kids have left party
18 kids are standing around
1/3 are dancing
how many kids were originally at party