exam Maths Puzzle Numerical Ability

Which property of the real numbers is illustrated by the following statement?
(6+12)+8=6+(12+8)?

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exam Other Question
Find the length X. Express your answer in simplified radical form.

I am going to try to draw the triangle:

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- - Please help me solve the following problem:

Find all the real zeros of {{{3x^4 + 3x^3 -17x^2 + x - 6 =0}}}

Thank You