Question: In a typing class, the average number N of words per minute typed after t weeks of lessons is N = 157 / (1 +

In a typing class, the average number N of words per minute typed after t weeks of lessons is
N = 157 / (1 + 5.4e−0.12t).
Find the time necessary to type (a) 50 words per minute and (b) 75 words per minute.

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