# algebra

posted by rhey

The second term of an arithmetic sequence is 24 and the fifth term is 3.Find the first term and the common difference.

1. Reiny

a+d = 24
a+4d = 3
subtract them:
3c = -21
d = -7

in a+d=24
a=7=24
a = 31

first term is 31, common difference is -7

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