exam Maths Puzzle Numerical Ability

Can someone please help! I had these multiple choice questions for homework and get them wrong.

8 over square root 7 - square root of 2

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exam Other Question

Please write the linear function for which f (3) =6 and f (-4) =2

Thank you
3y+20=3+2y

3(y+6)=30

-5y-9=-(y-1)

37-18+8w=67