Question

Find the first five terms of the described

sequence: Start with 6 and add 7 repeatedly.
State whether the sequence is arithmetic,
geometric, both, or neither.

Answer 1

6, 13, 20, 27, 34

arithmetic sequence

Explanation:

"Start with 6" means the first term is 6.

"Add 7 repeatedly" means each term is formed by adding 7 to the one before it:

6 +7 = 13

13 +7 = 20

20 +7 = 27

27 +7 = 34

So, the first 5 terms are ...

6, 13, 20, 27, 34

_____

Any sequence in which terms have a common difference is an *arithmetic* sequence. You know these terms have a common difference of 7, because that's the number you added to each term to get to the next term. 13-6 = 7; 20-13 = 7; 27-20 = 7; and so on.