who221b who221b

20-05-2016
Mathematics

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What is the 31st term in the sequence below?
-108,-90,-72,-54

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apologiabiology apologiabiology

20-05-2016

add 18 each time
first term is -108

an=a1+d(n-1)
d=common difference
a1=startng term

an=-108+18(n-1)

31 term
a31=-108+18(31-1)
a31=-108+18(30)
a31=-108+540
a31=432

31st term is 432

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