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10. A language analyst determines that the number of words M(t) still retained t days after studying 120 French vocabulary words is given by the

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10. A language analyst determines that the number of words M(t) still retained t days after studying 120 French vocabulary words is given by the function M(t) = 20 + 80e-0.68t Answer all the following: (a) Find the number of words still retained after 2 days. (b) Find M'(2), and explain what the answer means. t-+ 00 (c) Find lim M(t), and explain what the answer means

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