book Maths Puzzle Numerical Ability

I have one more (18x^5y^2/6x^2y^-4)^-1. I am hoping with the explantion I will be able to understand more. Thank you for your help..

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book Other Question

can you please help me with this equation..
what is the slope and y-intercept for the line:-10x-5y+20=0
Simply the radical expression. Assume all variables represent positive real numbers.

SQRT( 12a3/25)