exam Maths Puzzle Numerical Ability

How Many Diagnols a 11 sided polygon have?????? srying for spelling

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seniors performnd the same experiment on three groups of subjects and obtained mean scores of 84, 69, and 76. The groups consisted of 13, 31, and 27 subjects respectivly. What is the overall mean for all subjects to 2 decimal places? I have 3 different problems that I am confused about. Please help me. The 1st one is2+3*5square root2-7. #2) (4/2)+4(5-2)square root 2. #3)-8-81/9*2square root 2+7. Can you pleas h