SOLUTION: Find a_65 for the arithmetic sequence: 9,5,1,−3...

Question 1161364: Find a_65 for the arithmetic sequence: 9,5,1,−3...
Found 2 solutions by ikleyn, MathLover1:
Answer by ikleyn(52781)   (Show Source): You can put this solution on YOUR website!
.

The first term of this arithmetic progression is = 9. The common difference is d = -4. The general formula is = . In your case it takes the form = 9 - 4*(64-1). You do the arithmetic.

------------------

For introductory lessons on arithmetic progressions see
    - Arithmetic progressions
    - The proofs of the formulas for arithmetic progressions
    - Problems on arithmetic progressions
    - Word problems on arithmetic progressions
in this site.

Also, you have this free of charge online textbook in ALGEBRA-II in this site
    - ALGEBRA-II - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this online textbook under the topic "Arithmetic progressions".

Save the link to this textbook together with its description

Free of charge online textbook in ALGEBRA-II
https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson

into your archive and use when it is needed.

Answer by MathLover1(20849)   (Show Source): You can put this solution on YOUR website!

Find for the arithmetic sequence:
,,{{1}}},..

RELATED QUESTIONS
Use the arithmetic sequence of numbers 1, 3, 5, 7, 9,�to find the following: a)What is... (answered by sarah_adam)
Find S[5] for the arithmetic sequence with a[3]=39 and a[5]... (answered by stanbon)
Use the arithmetic sequence of numbers 1. 3, 5, 7, 9,...to find the following: a) what... (answered by stanbon)
Use the arithmetic sequence of numbers 1, 3, 5, 7, 9,�to find the following: a) What is (answered by jim_thompson5910)
1.Write in sigma notation: 0+3+8+15+24+35+48 2. Find the 10th term of the arithmetic... (answered by htmentor)
Two terms of an arithmetic sequence are a5=11 and a32=65. Find a rule for the nth... (answered by stanbon)
find the sum of the following arithmetic sequence... (answered by KMST)
Find a formula for an for the arithmetic sequence. a1 = 100, d =... (answered by ikleyn)
The first term of a sequence are 1, -5/2, 2, and -3/2. determine whether the sequence is... (answered by stanbon)
``write the first six terms of the sequence 2. an=(n+1)^3 4. an=n/n+3 write the... (answered by CubeyThePenguin)