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virtus

  • 2 years ago

the fourth, sixth and eigth terms of an AP add to -6. Find the sixth term

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  1. FoolForMath
    • 2 years ago
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    \[ \cdots 2,-2,-6, \cdots \]

  2. virtus
    • 2 years ago
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    huh?

  3. FoolForMath
    • 2 years ago
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    answer is -2 ?

  4. virtus
    • 2 years ago
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    ohhhh how did you find it

  5. virtus
    • 2 years ago
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    please show working thx

  6. FoolForMath
    • 2 years ago
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    I guessed :D

  7. virtus
    • 2 years ago
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    LOL

  8. virtus
    • 2 years ago
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    hahaha yes totally you know i think you should change your username to GENIUSFORMATH hehehe

  9. virtus
    • 2 years ago
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    so a+3d + a +5d + a +7d= -6 3a +15d=-6 divide all by 3 a+ 5d = -2 a +5d = the sixth term

  10. FoolForMath
    • 2 years ago
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    Great! :)

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