arithmetic
posted by Anonymous .
If the first term of an arithmetic sequence is 10 and the 13th term is 58, what is the common difference?

arithmetic 
helper
The nth term of an arithmetic progression is defined by
n = a + (n1)d where,
n = the nth term
a = the first term
d = the common difference
Therefore,
58 = 10 + (13  1)d
48 = 12d
d = 4
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