Posted by **Charmian** on Sunday, September 7, 2008 at 6:10am.

The 5th term and the 8th term of an arithmetic sequence are 18 and 27 respctively.

a)Find the 1st term and the common difference of the arithmetic sequence.

b)Find the general term of the arithmetic sequence.

- Mathematics : Arithmetic Sequence -
**Damon**, Sunday, September 7, 2008 at 6:29am
an = a1 + (n-1)d

18 = a1 + (5-1)d

27 = a1 + (8-1)d

so

-9 = -3d

d = 3

then a1 = 18 - 12 = 6

so

an = 6 + (n-1)3

- Mathematics : Arithmetic Sequence -
**khadijah**, Monday, June 20, 2011 at 3:47pm
common difference=3,1st term=6and general term=3+3n

- : Arithmetic Sequence -
**h**, Sunday, September 25, 2011 at 4:38pm
13,26,39,52

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