Deterimine the value of t20

  1. Deterimine the value of t20 in the followinf arithmetic sequence:1, -2, -5, -8, .........
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    2. Charu asked by Charu
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  2. How can one deterimine if a polynomial is the difference of two squares?please help me answer, thanks :)
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    2. Julissa asked by Julissa
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