exam Maths Puzzle Numerical Ability

9(2x)=(9 x 2)x
Would this problem be commutative, assosiative, identity or a false statement.

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exam Other Question

Solve each of the following systems by substitution.
8x-4y=16
y=2x-4 Evaluate without a calculator:
A) sin{ Arctan [(-5/13)]}

B)cos{ Arcsin[(-3/4)]}

C)Arccos[(-square root of 3/2)]

D) tan { Arcsin[(-3/4)]}