According to one model, the rate at which an animal's heart beats varies with its weight. Smaller animals tend to have faster pulses, whereas larger animals tend to have slower pulses. The table lists average pulse rates in beats per minute (bpm) for animals with various weights in pounds (lb). Use regression (or some other method) to find values for a and b so that f(x) = ax^b models these data.

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Weight (lb) Pulse (bpm) 40 140 150 400 1000 2000 72 44 28 20