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college

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The first difference of a sequence is 6, 10,14,18. The sum of the first two terms of the original sequence is 24. Find the first three term of the original sequence. the first term of the original sequence is?

  • Math? needs help - ,

    Select the name of the School Subject carefully or the right teacher will not even see your post. the Subject is NOT "college."

    Sra

  • college - ,

    let the first three terms be a, b, and c

    we know
    a+b = 24 (#1)
    b-a = 6 (#2)
    c-b =10 (#3)

    add 1 and 2
    2b = 30
    b=15

    in 1 ---> a+15 = 24 ,
    a = 9

    in 3
    c - 15 = 10
    c = 25

    a=9
    b=15
    c=25

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