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The 8th term of a linear sequence is 18 and the 12th term is 26.find first term,the common difference,the 20th term.

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term(8) = a + 7d = 18
term(12) = a + 11d = 26
subtract them....
4d = 8
d = 2

sub that into one of the above equations to find a,
then term(20) = a + 19d = .....

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