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10 September, 14:20

Find the sum: 28 is on top of the E, I=1 is on the bottom of the E, and (8i - 13) is on the right side of the E a. 2884 b. 205 c. 3024 d. 211

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  1. 10 September, 17:55
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    Sum:

    ∑ (from i = 1 to i = 28) (8 i - 13)

    S n = n/2 (a 1 + a n)

    n = 28

    a 1 = 8 · 1 - 13 = 8 - 13 = 5

    a n = 8 · 28 - 13 = 211

    S n = 28/2 · ( - 5 + 211) = 14 · 206 = 2,884

    Answer: A) 2,884
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