exam Maths Puzzle Numerical Ability

How do I calculate the sum of the Interior angles of a convex 18-gon

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Perform the indicated operations

5x -2/x2nd power - 5x -14 - 3/x2nd power + 2x A disc jockey must play 12 commercial spots during 1 hour of a radio show. Each commercial is either 30 seconds or 60 seconds long. If the total commercial time during 1 hour is 8