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katiebugg

  • 3 years ago

find the first term of the arithmetic sequence an = 48, Sn = 546, n = 26

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  1. Snapbacklive
    • 3 years ago
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    an= a1+ (n-1)·d --> 48=a1+25·d Sn= (a1+an)·n/2 = 546 --> (a1+48)·13= 546 --> a1+48=42

  2. katiebugg
    • 3 years ago
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    so its -6??

  3. mathslover
    • 3 years ago
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    yes ..

  4. katiebugg
    • 3 years ago
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    thanks

  5. mathslover
    • 3 years ago
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    pleasure

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