book Maths Puzzle Numerical Ability

What is the interior angle sum of a 30-sided Polygon- show the formula.
(its an extra credit question for tonight)

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book Other Question

Can someone help me solve this. Thank you in advance.
Use long division to reduce (6x^5 - 5x^4 - 6x^3 - 10x^2 + 21x - 9)/(2x - 3). what is the surface area of a square that has 11 inches on all sides?