exam Maths Puzzle Numerical Ability

I need to check these four problems, can anyone help?

3^sqrt(-27)

sqrt(-3x)^2
(with the square inside the square root sign)

sqrt(-4)

3^sqrt(-1/8)

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exam Other Question

My equation is:

Five plus a number is at least 16

I dont have a clue,much less an answer if anyone can help me I would appreciate it:)

Kia,14 In isosceles triangles ABM and BMN, medians ME, BD, NP, and CM are dropped to the legs. If AE+ME+MC+BC=32, use a two column proof to determine AD+BD+BP+NP?