exam Maths Puzzle Numerical Ability

Find the sum of the measures of the interior angles of a convex polygon with the given number of sides.

Number of sides --> 6

Help with this equation would be appreciated.

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exam Other Question
If f(x)=x^4-x+2, then f(-x)=

This is the problem and I cannot find the answer. Given f(x) = 3 x+8 and g(x) = sqrt(x+3), find f ° g(4) and g ° f(4), giving exact answers (using sqrt if necessary).