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Mathematics 12 Online
OpenStudy (anonymous):

If air resistance is neglected, a falling object travels 15 ft during the first second 45, 75 ft during the next, ft during the next, and so on. These distances form the arithmetic sequence 15, 45, 75, . In this sequence, a1=15 and d=30. Find a formula for f(n), the distance fallen by the object in n seconds

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