At OHaganBooks.com, the rate of net sales (sales minus returns) of The Secret Loves of John O, a romance novel by Margó Dufón, can be approximated by n(t) = 198 + t2 − 0.12t5 copies per week t weeks since its release. (a)Find the total net sales N as a function of time t. (b)How many books are still held by customers after 6 weeks? (Round your answer to the nearest book.)   books

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