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What is the volume of a cone with a height of 6 cm in the radius of 2 cm

Kayla made observations about the sellin price of a new brand of coffee that sold in the three different sized bags she recorded those observations in the following table 6 is $2.10 8 is $2.80 and 16 is to $5.60 use the relationship to predict the cost of a 20oz bag of coffee.

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers