Andrew was Making a science project. He worked 6.6 hours the first week, 2.75 hours the second week and 4.4 hours thethord week

Although answer is incomplete, I would assume that you would add the three numbers up.

Step-by-step explanation

Equation: 6.6 + 4.4 + 2.75 weeks

Step 1. Add either numbers. I decided to do this - 6.6 +4.4 = 11.0

Step 2. Add eleven to 2.75 - 11.0 + 2.75 = 13.75

Step 3. Finalize answer; 13.75 weeks

Check:  

I will subtract the 3 numbers in the same order I added them in.

Step 1. 13.75 - 2.75 = 11.0

Step 2. 11.0 - 6.6 = 4.4

Check is valid so the answer is correct.

Hope this helps.

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

a king of hearts and a 2 of spades