Suppose a particle’s position is given by f (t) = −2 / t, where t is measured in seconds and f (t) is given in centimeters. At what time is the velocity of the particle equal to 4 cm / s?

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A: fx=x23fx+h=x+h23At x=8f8+h=8+h23f8=823=23×23=4

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A: NOTE: Refresh your page if you can't see any equations. . take derivative

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Q: proportional

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Q: If f(x) = 12x2 − x3, what is the rate of change of f '(x) at  (−1, 13)?

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