What is the 30th term of the sequence?

What is the 30th term of the arithmetic sequence -8,-11,-14,-17,-20,......?

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Since you are looking for the 30th term and the common difference is -3,
start with the first term, -8 and subtract 3 twenty-nine times to get to the 30th term.

-8 - 3(29)   {start with -8 and subtract 3, 29 times}
= -8 - 87   {multiplied -3 by 29}
=  -95   {subtracted}

-95 is the 30th term

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