exam Maths Puzzle Numerical Ability

-1/2 I6x-3I < or equal to -3/2

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exam Other Question

square root of x+4-(minus) square root of x=4

square root of y+10-(minus) square root of y-2=2

square root of 3x-2- square root of x-2=2

square root of 16x+1- square root
I am trying to evaluate expressions with logs, the problem that I am stuck on is log2 1/8 (Log of 2 and 1 eightth).