Find the first 4 terms of an Arithmetic Sequence with 7th term of 18 and the common difference is 3/2

not exactly sure how to do this thanks in advance

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- Nov 19th 2008, 02:00 PMciviliamArithmetic Sequence
Find the first 4 terms of an Arithmetic Sequence with 7th term of 18 and the common difference is 3/2

not exactly sure how to do this thanks in advance - Nov 19th 2008, 02:10 PMskeeter
$\displaystyle a_n = a_1 + (n-1)d$