Posted by **Samantha** on Thursday, June 4, 2009 at 9:11pm.

What is the 23rd term in the arithmetic sequence: 11, 14, 17, 20...?

All I need is the formula to find the it because I have to show work. Thanks.

- Math (Algebra/Pre-Algebra) -
**Reiny**, Thursday, June 4, 2009 at 9:35pm
if a is the first term

and d is the common difference

then Term(n) = a + (n-1)d

- Math (Algebra/Pre-Algebra) -
**Samantha**, Thursday, June 4, 2009 at 9:44pm
thanks =]

- Math (Algebra/Pre-Algebra) -
**Samantha**, Thursday, June 4, 2009 at 9:50pm
so a = 11 and d = 3, so 23 = 11 + (23-1) 3.

The 23rd term is 77 because 11 + 22(3) = 77 =]

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