find the 54th term of the sequence -8, -5, -2, . .

You should look here

http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html

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find the 54th term of the sequence -8, -5, -2, . .

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The n^th term is given by:  

a_n = -8 + 3(n-1)

See if you can take it from there........