Question 1160027
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 7, 2, -3, -8, -13,... then find a_14
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Notice common difference to each successive term is  5, going downward for each.  First term is 7.


Arithmetic Progression:  General term {{{7+(-5)(n-1)}}}  or  {{{7-5(n-1)}}}.



The fourteen term,   n=14:
{{{7-5(14-1)}}}
{{{7-5*13}}}
{{{highlight(-58)}}}