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starrhunter

  • 3 years ago

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

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

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

  3. hartnn
    • 3 years ago
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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 ?

  4. starrhunter
    • 3 years ago
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    but you already put what they equal??

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

  6. starrhunter
    • 3 years ago
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    33*6 then?

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

  8. hartnn
    • 3 years ago
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    9+24*6=...?

  9. blondie16
    • 3 years ago
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    you multiplt 24 by 6 first then add 9

  10. hartnn
    • 3 years ago
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    first you multiply.

  11. starrhunter
    • 3 years ago
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    oh right. PEMDAS

  12. starrhunter
    • 3 years ago
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    153

  13. blondie16
    • 3 years ago
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    very good!

  14. hartnn
    • 3 years ago
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    yes.

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