- In a group of 5 people, in how many different ways could they be friends?

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What's the half-life of a substance if 250 grams decays to 150 grams in 4 years, round to 2 decimals. pls show work so I can learn it.? How many chromosomes are in each parental cell at the end of meiosis I? Find the surface area of a right circular cone of radius 2 and height 3 i got 4(pi)+2(pi) rad(13) which is wrong i guess? Why is limiting nutrient a disruption in an ecosystem? Carbon molecules that bond together to form more complex moleules?

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