1.5 Finding the nth Term of a Quadratic Sequence

Find the value of the 85th term:

1. 4, 8, 12, 16, 20...
2. 5, 7, 9, 11, 13, ....
3. 6, 12, 20, 30, ...
4. 0, 1, 4, 9, 16, ...
5. 2, 9, 20, 35, 54, ...
6. 0, 3, 8, 15, 24, 35, ....
7. 4, 10, 18, 28, 40, 54, ...
8. 6, 21, 40, 63, 90, 121, ....
9. -3, 8, 25, 48, 77, 112, ...
10. 6, 25, 56, 99, 154, 221, ....
11. 2, 5, 9, 14, ....
12. 3, 6, 10, 15, ...
13. 0, 1, 3, 6, 10, 15, ....
14. 3, 10, 20, 33, 49, 68, ....
15. Find the sum of the first 100 odd whole numbers. (no, don't use a calculator! make a term a and value chart. label the top row "# of odd whole numbers". label the bottom row "sum". find the nth term!)
16. Find the sum of the first 100 even whole numbers.
17. Find the sum of the first 100 consecutive whole numbers.
18. Find the next two terms: 7, 2, 5, -3, 8, -11, ?, ?
19. Find the next two terms: 1, 4, 10, 20, 35, 56, ?, ?
20. Find the next two terms: 30, 80, 134, 193, 258, 330, ?, ?

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