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7 September, 13:38

The sequence an = 27 (one third) ^ n-1 is graphed below. Find the average rate of change between n=2 and n=4

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  1. 7 September, 17:31
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    Rate of change

    find a2 and a4

    a2=27 (1/3) ^ (2-1) = 27 times 1/3=9

    a4=27 (1/3) ^ (4-1) = 27 times 1/27=1

    rate of change = (a4-a2) / (4-2) = (1-9) / (4-2) = - 8/2=-4

    average rate of change is - 4
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