#1
arithmetic sequences and series.


determine d if a = 12, tn = 19, and n = 10.

the formula is tn=a(n-1)d but i can't remember how to do it. can anyone help?
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#2
penis
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#3
Quote by stevo_92
arithmetic sequences and series.


determine d if a = 12, tn = 19, and n = 10.

the formula is tn=a(n-1)d but i can't remember how to do it. can anyone help?



19 = 12 (10-1)d

19 = 12*9*d
19 = 108d
19/108 = d


I think.
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