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The formula to calculate the volume of a cone is V = (1/3)πr²h, where r is the radius and h is the height.
V = (1/3)(3.14)(3²)(7)
V = (1/3)(3.14)(9)(7)
V = (0.33)(3.14)(9)(7)
V = (0.33)(28.26)
V = 9.34 cubic inches
Therefore, the coffee maker can hold approximately 9.34 cubic inches of coffee grounds.