book Maths Puzzle Numerical Ability

If a < b, then -a >-b Why?

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book Other Question

Let C = 125/64. Then find C^-2/3. just 2 questions that are linked

if log(base 2)5 = x find an expression for...
1. log (base 2)20 = ??
2. log (base 2)[(cube root 5)/2]=??

if u could answer these that would be a huge help thx