book Maths Puzzle Numerical Ability

x is not greater than or equal to 0. then Root of x root of x root of x is?

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book Other Question

log(10x)^2=2+2logx This one is false right? Thank you for helping me. I am not sure how to solve this problem, please help me!

2/5 = /10

2 over 5 equals some number over10