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Mathematics, 12.03.2021 01:00 yuki430

The function f(x) = 3x2 + x + 1 represents the number, in thousands, of wrist bands Lin expects to sell x weeks after opening her shop. What is the average rate of change over the interval 1 <=x<= 2? D. -10 C. 15 B. 5 A. 10​

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