book Maths Puzzle Numerical Ability

I DONT UNDERSTAND THEM I NEED SOMEONE TO EXPIAN THEM..IN SIMPLE WORDS PLEASE!!!..ASAP

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book Other Question

solve x^4-5x^2+6=0 Question:
Writing radial expressions in simplified radical form.
Simplify.
Square root of 7/square root of 18. this is written as a fraction.
Thank you