exam Maths Puzzle Numerical Ability

a) 412-2/3
b) 3+10/3-12
c) (3+4)*3-6/9
d) 7x-11y=1
e) 4x+5y=12

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I need help with 3x^2 - 2x + 1 = 0

I came out with x = 2/6 + sqrt 8/6

Did I do this right?

I see the answer, but am confused on what the "i" means? solve each of the following inequality. express your final answer using interval notation.

a) -2>-2y-10>-22

b) x/4+3 <4

C) x?8+5 >4