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7 March, 14:27

The 15th term of arthimetic sequence is 43 and the common difference is 4 find the first term

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  1. 7 March, 15:19
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    Step-by-step explanation:

    hello:

    the nth term of an arithmetic sequence is:

    An = An + (n-p) d ... a common difference is : d

    let : n=15 and p=1 d = 4 A15 = 43

    A15 = A1 + (15-1) (4)

    43 = A1 + 56

    A1 = 43-56 = - 13
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