Algebra: please help me.

The following problem refers to an arithmetic sequence. if a_8=9 and a_16=17, Find the term a_1, the common difference d, and then find a_30.
a_n=a_1+(n-1)*d

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  1. Just use your formula
    a_8=9 ----> a+7d = 9
    a_16=17 --> a+15d = 17
    subtract them:
    8d = 8
    = 1
    then find d, and finally find term(30)

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