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starrhunter

What is the 25th term of the arithmetic series 9, 15, 21, ...? (3 points) 151 152 153 154

  • one year ago
  • one year ago

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  1. hartnn
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    do u know the n'th term formula for arithmetic series?

    • one year ago
  2. starrhunter
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    I know the formula i just always have a hard time plugging numbers in

    • one year ago
  3. hartnn
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    ok, 1st term a1 = 9 common difference d=15-9 = 6 n=25. plug them in and tell me what u get ?

    • one year ago
  4. starrhunter
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    but you already put what they equal??

    • one year ago
  5. hartnn
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    an = a+(n-1)d so, a25 = 9+(25-1)6 can u find a25 ?>

    • one year ago
  6. starrhunter
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    33*6 then?

    • one year ago
  7. starrhunter
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    but that isn't one of the answers I am doing something wrong

    • one year ago
  8. hartnn
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    9+24*6=...?

    • one year ago
  9. blondie16
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    you multiplt 24 by 6 first then add 9

    • one year ago
  10. hartnn
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    first you multiply.

    • one year ago
  11. starrhunter
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    oh right. PEMDAS

    • one year ago
  12. starrhunter
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    153

    • one year ago
  13. blondie16
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    very good!

    • one year ago
  14. hartnn
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    yes.

    • one year ago
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