exam Maths Puzzle Numerical Ability

What is the number of sides in a 900 degree convex polygon?

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exam Other Question

I think i need to multiply the exponents but im not entirely sure.
(3x^2y^3/4x^-2)^3 will you please help me with this equation? im having a hard time figuring it out.

Solve the quadratic equation
1/1+x-1/3-x=6/35