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The first term of an arithmetic sequence is - 5, and the tenth term is 13. Find the common difference. A.) 2 B.) 1.8 C.) 8/9

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  1. 4 June, 09:16
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    A

    d = 2

    Step-by-step explanation:

    Formula

    l = a + (n - 1) d

    Givens

    n = 10

    a = - 5

    l = 13

    Solution

    13 = - 5 + (10 - 1) d Substitute

    13+5 = - 5+5 + 9d Add 5 to both sides

    18 = 9d Divide by 9

    18/9 = 9/d

    d = 2
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