Let f be the function that determines the area of a circle (in square cm) that has a radius ofr cm. That is, f(r) represents the area of a circle (in square cm) that has a radius of r cm. Use function notation to respond to each item below. a. Represent the area (in square cm) of a circle that has a radius of 3.9 cm. Preview b. Represent how much a circle's area (in square cm) increases when the circle's radius increases from 10.3 to 10.31 cm. Preview c. Represent the total area of 6 circles that each have a radius of 12.1 cm. Preview d. A circle has a radius of 21 cm. A second circle has an area that is 51 square cm more than the first circle. Represent the area of the second circle. Preview

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