Asample originally contains 21 grams of a radioactive isotope. after 45 days, 17.3 grams of the isotope remain in the sample.

what is the half-life of the isotope?

enter your answer in the box. round your answer to the nearest day.

1. 3.4/4

2. 0.8/7

3. 0.5 x 3

4. 0.9 x 6

5. 10.8

6. 2.35

7. 0.567

8. 9.35

9. 0.02

10. 0.06

11. 0.16

12. 0.42

13. 0.63

14. 5.6

15. 8.1

16. 9.9

17. 0.28

18. 0.48

19. 0.27

20. 0.49

21. 0.45

22. 0.72

23. 0.9

24. 0.88

25. 0.75

26. 0.16

27. 0.328

28. 0.495

29. 0.72

30. 1.068

the answer is y < -3 or   y > 3

-3y > 7 + 2

-3 y > 9

y < -3

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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step-by-step explanation: there is no picture