Arithmetic sequences

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summer9607

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Sep 17, 2012
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In excercises 13-18, find the kth partial sum of the arithmetic sequence {un} with common difference d.

13. k=6,u1=2,d=5
14. k=8,u1=2/3,d=-4/3
15. k=7, u1=3/4,d=-1/2
16. k=9,u1=6,u9=-24
17. k=6,u1=-4,u6=14
18. 10,u1=0,u10=30


I need the answers to all of these
 
summer9607 said:
In excercises 13-18, find the kth partial sum of the arithmetic sequence {un} with common difference d.

13. k=6,u1=2,d=5
14. k=8,u1=2/3,d=-4/3
15. k=7, u1=3/4,d=-1/2
16. k=9,u1=6,u9=-24
17. k=6,u1=-4,u6=14
18. 10,u1=0,u10=30


I need the answers to all of these
Click to expand...

We need to see your work on all those...

Please share your work with us, indicating exactly where you are stuck - so that we may know where to begin to help you.
 
summer9607 said:
I dont know how to do it thats why I need help
Click to expand...
Let's start at the beginning. How does your book define an arithmetic sequence? Is there anything about that definition that you do not understand?
 
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