Difference of 7th and 12th terms in an arithmetic sequence is 20, the common difference is
4
-4
5
6
The first term of an arithmetic sequence is 7 and the common difference is −2. What is its 12th term?
The common difference of an arithmetic sequence is −1 and its 4th term is 7. What is its 7th term? And the 11th term?
The 5th term of an arithmetic sequence is 9 and its 9th term is 5. What is its common difference? What is the 14th term?