exam Maths Puzzle Numerical Ability

I am a little confused here! Can you help me with this question on exponent rules? (-2xy^-3)^-3 over (xy^-1)^-1

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exam Other Question

Given: lines AB, DE, and CF; line CG bisects angle BCF, and the line FG bisects angle CFE and i have to prove angle G is a right angle... if i could draw the picture it would be easier to explain it Determine whether the three points are the vertices of a right triangle:

1) M(-6;-4); N(0;-2); Q(-10; 8)

2) M(-4;1); N(1;4); Q(-6;-1)

3) M(-4;3); N(2;5); Q(-1;-6)