book Maths Puzzle Numerical Ability

My daughter says that her teacher did not explain how to convert unit multipliers.? I am not sure what she is asking. Can you help us please.
Thank you.

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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
4y^2 - X^2= 0

X^2 + 2y^2= 2x + 9