The area of a circle is represented by the following expression, where r is the radius of the circle. find the approximate area of a circular pool cover with a radius of 12.5 meters. use 3.14 for .

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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?