exam Maths Puzzle Numerical Ability

Evaluate the expression and write the result in the form a + bi.

sqrt(1/3)sqrt(-27)

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exam Other Question

Hopeless need help!
express with only positive exponents??????????
a)
x^2-2x-15/x^2-x-6 divide x^2-5x/x^2-4

b)
6/x-1 subtract x+2/x

c)
(x+3)^2-2(x+1)

d)
{3y^2z/x^ put equations into y= and change them so they are shaded inequalities - I have no idea what this is talking about !!!! HELP PLEASE
y<=1/2x+8
y>-2x+4
y>2x+4
THANKS