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March 27, 2017

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Find the no. of terms
1. 3,5,7...33
2.-5,-1,3,...75

Solve each problem.
1. In the Arithmetic sequence 5,8,11,14.... what is n if a sub n is 32?
2.Find the sum of the first 20 terms of the arithmetic sequence -15,-7,31,43...

  • Math - ,

    1. term(n) = a+(n-1)d
    you have a = 3, d = 2 , n = ??
    33 = 3 + (n-1)(2)
    30 = 2n - 2
    28 = 2n
    n = 14 ------ there are 14 terms

    do the 2nd one the same way

    for the other two, I don't know how you defined a sub n

    for the last:
    first find the number of terms in the same way I showed you
    you have a = -15 , d = 12 , n = ?
    once you find a and d
    use
    Sum(n) = (n/2)(2a + (n-1)(d) )

  • Math - ,

    Thank you so much . 1. In the Arithmetic sequence 5,8,11,14.... what is n if an is 32?
    1. In the Arithmetic sequence 5,8,11,14.... what is n if n is 32?

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