exam Maths Puzzle Numerical Ability

8-[3-2(9-7)-12]-11=
simplify by using order of operations, I am confused any help I will deeply appriciate

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exam Other Question

What is 1/6 as a decimal?
0.16666666666......
Cheers,
Stan H.
What type of conic section is the following equation?

4x2 + 4(y2 - 4) = 0