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13 July, 20:28

The first term of an arithmetic sequence is - 5, and the tenth term is 13. Find the common difference.

8/9

1.8

2

+5
Answers (1)
  1. 13 July, 20:38
    0
    2

    Working

    The nth term of an arithmetic series is calculated using the formula

    nth term = a + (n-1) d

    a = - 5, n = 10 and nth term in this case is 13

    Thus

    13 = - 5 + (10-1) d

    13 = - 5+9d

    9d = 18

    d = 2
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