exam Maths Puzzle Numerical Ability

is c+(a+b)=(a+b)+c an example of the commutative property? is (a*b)c=a(b*c) also an example of commutative property?

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exam Other Question
How do I figure this one out? 17. Build each rational expression into an equivalent rational expression with the indicated denominator.
-9z = ____?____
_____ ________
2aw 8aw √3 - √1/3




answer is 2√3
___

3


I need to know how to get the answer.