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badATalgebra

  • 3 years ago

What is the sum of a 17-term arithmetic sequence where the first term is 7 and the last term is -105?

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  1. badATalgebra
    • 3 years ago
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    whoevers first

  2. cwrw238
    • 3 years ago
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    the formula for this is Sum = ( n/2){ a + l) whre n = number of terms , a = first term and l = last term

  3. marsss
    • 3 years ago
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    (-105-7)/16=-7(common difference) (-105+7)(-105-7+7)/(-14)=-810

  4. badATalgebra
    • 3 years ago
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    -833 -893 -913 -943 these are the choices

  5. cwrw238
    • 3 years ago
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    = 8.5 *(7 - 105)

  6. cwrw238
    • 3 years ago
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    = -833

  7. badATalgebra
    • 3 years ago
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    833, but i got a positvie

  8. badATalgebra
    • 3 years ago
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    Thank you!

  9. marsss
    • 3 years ago
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    yes i had a mistake. sorry :)

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