who221b who221b

19-05-2016
Mathematics

contestada

what is the 41st term -13,-17,-21,-25...

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apologiabiology apologiabiology

19-05-2016

adds -4 each time
first term is -13
an=a1+(n-1)d
d=common difference
a1=first term
an=-13+(n-1)(-4)
an=-13-4(n-1)

41 term
a41=-13-4(41-1)
a41=-13-4(40)
a41=-13-160
a41=-173

-173

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