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

whoever is answering this question dont answer it please just tell me if i am doing it right
-2=7(q+2)+3(2q-1)
then
-2=7q+14+6q-3
then
im not sure about the rest though can you please help me
Solve for angle &#952; to the nearest degree, 0 degrees <(or equal to)&#952; < (or equal to) 90 degrees

a) sin &#952; = 1/2
b) tan &#952; = square root 3
b) cos &#952; = 0.253