book Maths Puzzle Numerical Ability

Please help me to find a genral rule for calculating the sum of angles for any n- sided polygon...
Help its homework and needed by Sunday the 16th of October
Cheers,

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my questions is
solve m+9.35=2.73

my answer is m=-6.62
thanks for the help two althetes are running a 40km race. the first runner ran 5km faster than the second and finished the race 40 mins soone. find each runners speed