exam Maths Puzzle Numerical Ability

find out 3 irrational numbers between 5/7 and 9/11/

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exam Other Question

7x^2 -175 I am suppose to simplify and be sure I execute all multiplication and division.

3{2[4(x^2+2)-2(x^2-5)]}

This is what I got 12x^2+108 Is this right?
Thanks, Lackinmath