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  • 14-06-2018
  • Mathematics
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Which rule can you use to find the nth term of an arithmetic sequence in which the common difference is 5 and a12 = 63?

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creeperjyx
creeperjyx creeperjyx
  • 14-06-2018
tn = a + (n-1)d

when n  = 12, tn  = 63

63 = a + (12-1)*5

a = 63 - 55 =8

tn or an 
= 8 + (n-1) 5

=  3 + 5n

Hope this helps
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