- #1
nobb
- 33
- 0
Hi. Please explain to me how to do these three problems:
1. The terms x+3, 3x-1, and 7x-2 are consecutive terms in an arithmetic sequence. Find x.
2. The sum of the first twenty-eight terms of an arithmetic series if the sum of the first twelve terms is -72 and the sum of the first twenty-four terms is 144.
3. Find a, d, and tn for this sequence: t4= -9 , t15 = -31
1. The terms x+3, 3x-1, and 7x-2 are consecutive terms in an arithmetic sequence. Find x.
2. The sum of the first twenty-eight terms of an arithmetic series if the sum of the first twelve terms is -72 and the sum of the first twenty-four terms is 144.
3. Find a, d, and tn for this sequence: t4= -9 , t15 = -31