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anonymous

  • one year ago

Find an equation for the nth term of the arithmetic sequence. a19 = -58, a21 = -164 an = 896 - 53(n - 2) an = 896 - 53(n - 1) an = 896 + 53(n + 1) an = 896 - 53(n + 1)

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  1. anonymous
    • one year ago
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    @peachpi

  2. anonymous
    • one year ago
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    now you have to find a1 and d. d is like slope, and you can think of the numbers as points, so use something like the slope equation |dw:1435788072594:dw|

  3. anonymous
    • one year ago
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    so it would be -146 - -58 / 21- 19 = -44

  4. anonymous
    • one year ago
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    then what

  5. anonymous
    • one year ago
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    I got -53

  6. anonymous
    • one year ago
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    oh you used -146 instead of -164

  7. anonymous
    • one year ago
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    ohhhh ok nvm

  8. anonymous
    • one year ago
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    ok yea i got -53

  9. anonymous
    • one year ago
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    then use the a_n formula to solve a_1 |dw:1435788320276:dw|

  10. anonymous
    • one year ago
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    so it would be -a1=164-53(20)

  11. anonymous
    • one year ago
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    yes

  12. anonymous
    • one year ago
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    and then reduce that to get a number for a1

  13. anonymous
    • one year ago
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    so a1=896?

  14. anonymous
    • one year ago
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    yes

  15. anonymous
    • one year ago
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    so the answer would be an=896-53(n-1)?

  16. anonymous
    • one year ago
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    yes

  17. anonymous
    • one year ago
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    ok thank you so much!

  18. anonymous
    • one year ago
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    you're welcome

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