exam Maths Puzzle Numerical Ability

5-2^2/2-3=?

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exam Other Question

I am in need of some help with these question

Simplify by combining like terms:
x Sqaure root 18- 3 square root 8x^2

and
simplify each radical expression

(square root 3+5)(square root 3-3)

Thank you for your help I need help trying to work 2 problems #36 on page 623 which is 3/2-k - 5/k + 6/k^-2k and problem #40 same page which is 2/square root of 7-square root of 7. Thanks for the help.