exam Maths Puzzle Numerical Ability

Hi there! I am having terrible trouble trying to simplify this expression. Instructions say to simplify and express the answer using positive exponents.
[2x^(3/4)*y^(-1/2)]^(-8)

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exam Other Question

Determine which two equations represent parallel lines.
Hint: Remember which part of the equation will be the same in equations representing parallel lines.
(a) y = 8x - 6 (b) y = -8x + 6 (c) y = 8x + 5 (d) y = x - 6
if point a(-1,0) is rotated 60degree, the coordinates of point a would be