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A student needs to make a circular cardboard piece with an area between 154 square inches and 616 square inches. The function f(r) relates the area of the cardboard piece, in square inches, to the radius r in inches. Which of the following shows a reasonable domain for f(r)? a. 7 < r < 14 b. 154 < r < 616 c. all positive integers less than 7 d. all positive integers between 14 and 154
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