exam Maths Puzzle Numerical Ability

the sum of the measures of the interior angles of a polygon is between 2100 and 2400. how many sides does the polygon have? thanks..

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exam Other Question

Solve and check each of the following equations for x. more complicated and im thinking too much. thank you for helping me.

x/x-2 - x+1/x = 8/x^2-2x
Solve by substitution or elimination and specify which method you did:
6x + 2y = 10
5x - 3y = 27

(PS: Please show how you worked it out. I have been having mojor problems with these kinds of questions. Thanks.)