bumblebee123
Junior Member
- Joined
- Jan 3, 2018
- Messages
- 200
I have a question that I haven't been able to figure out for ages. Can anyone help?
Question: The 2nd term of an arithmetic sequence is 80
The 7th term of this arithmetic sequence is 20
Find the common difference of the series, then find the sum of all the positive terms of this arithmetic sequence
by using simultaneous equations I found the common difference ( d ) = -12 and the first term ( a ) = 92
I'm just stuck on the second part of the question- what do I do? any help would be appreciated
Question: The 2nd term of an arithmetic sequence is 80
The 7th term of this arithmetic sequence is 20
Find the common difference of the series, then find the sum of all the positive terms of this arithmetic sequence
by using simultaneous equations I found the common difference ( d ) = -12 and the first term ( a ) = 92
I'm just stuck on the second part of the question- what do I do? any help would be appreciated