exam Maths Puzzle Numerical Ability

This is another question that has me confused. Your explanation or steps would be helpful to solve my other equations. thanks

(x^2y^-1m^-3)^3
____________
2p^-4

thank you

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exam Other Question
seniors performnd the same experiment on three groups of subjects and obtained mean scores of 84, 69, and 76. The groups consisted of 13, 31, and 27 subjects respectivly. What is the overall mean for all subjects to 2 decimal places? write the equation in the slope intercept form for the line passing through (2,1) and (-1,3)

I know that slope intercept form is y=mx+b
and the slope is -2/3

any help?