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Calculus

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Write a formuls for the general term(nth term) of the arithmetic sequence. Do not use a recursion formula. Then use the formula for A to the n to find the indicated term of the sequence

find a11: 12, 10, 8,...

  • Calculus - ,

    The first term is a1
    Every subsequent term is a constant number d greater than the one before so it goes:
    a1
    a2 = a1 + d
    a3 = a1 + 2d
    a4 = a1 + 3d
    a5 = a1 + 4d
    .....
    an = a1 + (n-1)d

    for example
    a14 = a1 + 13*d

  • Calculus - ,

    makes no sense that's how i was doing it and I came up with 3.5

    a11 = 12 + 10(.8444) = 3.5

    however the answers to choose from are

    .32
    -8
    -10
    .34

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