Question 940731
Identify the common difference OR common ratio, depending on whether the sequence
 below is arithmetic or geometric. Then use the appropriate formula to write a rule for the
 sequence. Finally, use the rule to find the tenth term in the sequence.
 –15, –9, –3, 3, 9,…
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Arithmetic::
common difference = 6
a(n) = -15 + (n-1)6
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a(10) = -15 + 9*6 = -15 + 54 = 39

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Cheers,
Stan H.
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