A sample of radioactive material is decaying. If the amount, A grams, after time t hours is given by A = 10 ´ 3-t, the average rate of decay (g/h) of the sample between time t = 1 and t = 2 is closest to A       2.22 B       -3.33 C       -1.11 D       -2.22 E       -3.66

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