book Maths Puzzle Numerical Ability

whats the square root of 2 over 3

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book Other Question

fing the roots of the equestion:x^2+4x+8?
1.fing the roots by using compliting the squar method?
2.fing the roots by using factorisation method?
3.fing the roots by usin graphic
Hi, i need some help on idenifying the slope and y-intercept of the line.
One problem is: 3x - y = 12

Thanks for your time.