2 What features do all right triangles have in common?
A
Two legs and a hypotenuse
B
Two equal sides and two equal angles
C
Two 90-degree angles
D
Three sides of equal length

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Step-by-step explanation:

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The answer is A, 28. If there were ten people to start with, then persons 1-6 would make one group, persons 2-7 would make another, persons 3-8, persons 4-9, persons 5-10, persons 1, 8, 9 10, 4, 5, etc, if you go through all ten numbers and put them all in groups, the number og groups made would be twenty-eight