Thursday

March 5, 2015

March 5, 2015

Posted by **Anonymous** on Wednesday, September 26, 2007 at 1:16am.

A. 165

B. 171

C. 249

D. 168

Please explain. thanks

- math-algebra -
**PsyDAG**, Wednesday, September 26, 2007 at 12:21pmSubtract the difference from the last term

**13**times, since the last term is the 14th number. Can you think of a faster way to do this?

I hope this helps. Thanks for asking.

- math-algebra -
**tchrwill**, Wednesday, September 26, 2007 at 2:16pmThe last term of an arithmetic sequence is 207, the common difference is 3, and the number of terms is 14. What is the first term of the sequence?:

A. 165

B. 171

C. 249

D. 168

Please explain. thanks

The last, or nth, term of an arithmetic progression is defined by L = a + (n - 1)d where L = the last term, a = the first term, n = the number of terms and d = the common difference.

Therefore, 207 = a + (14 - 1)3

...............= a + 39

Therefore, a = 207 - 3396 = 168.

**Answer this Question**

**Related Questions**

Algebra - True or False 1. – 5, – 5, – 5, – 5, – 5, … is an arithmetic sequence...

Maths - 1..The first 2 terms of a geometric progression are the same as the ...

Math - A sequence is formed by adding together the corresponding terms of a ...

Precalculus - The 8th term in an arithmetic sequence is 5, and the sum of the ...

math - in an arithmetic sequence the common difference is equal to 2.the first ...

math - The 3rd term in an arithmetic sequence is 12, the 7th term is 24, a) How...

Arithmetic Sequence - Given the third term of an arithmetic sequence less than ...

Algebra - Determine whether each sequence is arithmetic or geometric. Find the ...

math - first term of the arithmetic sequence is 13. two other terms of the ...

math - find the rule for the Nth term of the arithmetic sequence. 11/2, 25/6, 17...