Question

In exercises 1 through 6 tell whether the sequence can be arithmetic or geometric, or neither. If it is arithmetic, find the common difference: if it is geometric , find the common ratio.

1. 7, 12, 17 . . .
2. 5, 10, 12, . . .
3. -1, 1, -1, . . .
4. 25, 50, 100, . . .
5. 25, 75, 100, . . .
6. 2, -4, 6, . . .
7. Which sequence(s) have a common difference of 3?

a) an = an - 1 - 3, a1 = 2
b) an = 3(n - 1)
c) an = an - 1 + 3, a1 = -7
d) an = n2 + 3



8. Find the sum of the infinite geometric sequence.

1 -1/5 + 1/25 - 1/125 . . .



9. Determine whether each

Answer 1

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