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OpenStudy (sasogeek):
the 3rd and 7th term of an arithmetic progression are -1 and 11 respectively. find the first term.
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OpenStudy (anonymous):
a + 2d = -1 => 3a + 6d = -3 a + 6d = 11 solve for a
OpenStudy (ash2326):
1st....3a+6d=-3 2nd....a+6d=11 1st-2nd 2a=-14 a=-7 a+6d=11 6d=18 d=3 first term is -7 common difference 3
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