If the circumference of a circleis 88m, find its diameter.

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Frank has a devised a formula for his catering business that calculates the number of meatballs he needs to prepare. the formula is m=4a+2c, where c=number of children; m=number of meatballs; a=number of adults. how many meatballs are required for a party of 10 adults and 5 children?

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?