The human brain can’t maintain relationships with more than 150 people - apex
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Dunbar's number states the number of people one knows and keeps social contact with, and it does not include the number of people known personal.
It would help if the question stated after which landmark number.
A number raised to the second power is a number times itself. This can also be stated as a number squared.
2.26 million is stated as 2,260,000.
A mixed number fraction is when you have both a whole number and a fraction stated together. For example, "three and a half" or "five and one quarter".
This is known as a mixed number. For example, the improper fraction 22/7 can be stated as the mixed number 31/7.