exam Maths Puzzle Numerical Ability

x^-1.5=27 . . . . . . I know that the answer is 1/9, but I have no idea how to get there.

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exam Other Question

How many positive real solutions are there in:
f(x)=x^4-4x^3+6x^2-4x+1
a)1 or 0
b)2 or 0
c)4 or 2
d)2 or 0 Hi.

Find an equation of the line through (-5, 6) with slope -10.

Thanks