What is 15 percent of 120

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

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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?