The number N of Walgreens drugstores in year x can be approximated by N = 6.82x2 − 1.55x + 666.8, where x = 0 corresponds to 1980.* Determine when the number of stores was or will be
(a) 4240
(b) 5600
(c) 7000
*Based on data from the Walgreen Company.
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