Xsquared plus y squared equals 80. my daughter has to work out what x and y are. i have worked it out by trial and error, but know there must be a method. !

you Need to think of 2 square numbers that add up to make 80

64 + 16

this means that x  = 8 and y = 4

because of the square roots

or

y = 4

and

x = 8

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