Find the 40th term of the arithmetic sequence with a = 150 and a common difference of d =-4. 1.-6 2.6 3.-2 4.2

Question

Find the 40th term of the arithmetic sequence with a = 150 and a common difference of d =-4.
1.-6
2.6
3.-2
4.2

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Hưng Khoa 1 year 2021-08-31T02:05:36+00:00 1 Answers 8 views 0

Answers ( )

  1. Nem
    0
    2021-08-31T02:06:44+00:00
    Reply

    Answer:

    1. -6

    Step-by-step explanation:

    a1 = 150

    a2 = a1 – 4 = 150 – 4 = 146

    a3 = a2 – 4 = a1 – 4 – 4 = 146 – 4 = 150 – 4 – 4 = 142

    …

    =>

    an = a1 – (n-1)×4

    =>

    a40 = a1 – 39×4 = 150 – 156 = -6

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