exam Maths Puzzle Numerical Ability

Name the property of real numbers illutstrated below. Be specific w/ the naming. Include "of addition" or of" multiplication if needed.
8*(4*9)= (8*4)*9

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exam Other Question
solve v2

v=v1+ v2
_______
1 + v1 *v2/c2 Could you please show me how to solve a number to a Power which is less than one such as:

12 to the power of 1/2

Thank you,
Paul