Asked by Samantha Cooper
what is the 15th term of an arithmetic sequence in which the third term is 1985 and the eighth term in 2015?
Answers
Answered by
Damon
a + d(n-1)
a + d (2) = 1985
a + d(7) = 2015
----------------subtract
0 - 5 d = - 30
d = 6
a + 12 = 1985
a = 1973
1973 + 6(14) = 2057
a + d (2) = 1985
a + d(7) = 2015
----------------subtract
0 - 5 d = - 30
d = 6
a + 12 = 1985
a = 1973
1973 + 6(14) = 2057
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