## 4-R Answer Key

*must show work to receive credit

1. summation from 1 to 20 of 1/2i

2. 3, __, 11__, __

3. __, 4, ___, ____, 13

4. a_n=9n+1; 1910

5. 80

6. 88

7. 4, ___, 1/4, ___, ____

8. 9, ___, 4, _____, 16/9

9. a_n = 16 (-.5)^n-1; 10.67

10. 127

11. 8

12. 6

13. 808,500

14. 41,943.04cm

15. 3a^3b^2

16. 3u^5/v^4

17. 2root2

18. 3root2

19. True..sum of digits = 18 which is divisible by 3 AND 40 is divisible by 4

16

Last modified: Monday, 19 December 2016, 10:02 AM