math

An indoor auditorium has a small side section that models an arithmetic sequence where the third row has 5 seats and the tenth row has 26 seats. If that section has 14 rows, how many seats would be in the last row?

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  1. a+2d = 5
    a+9d = 26
    7d = 21, so d=3 and a = -1
    A14 = -1+14*3 = 41

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