Ijust need with these math questions

1. Proportions are relatively easy; we can reduce the fractions or check the cross product

4/20 = 1/5 not 1/6

28/36 = 7/9, CHECK

14/18=7/9,  21/27=7/9  CHECK

30/80=3/8, 6/18=1/3, nope

2. Let's check cross products on these

3(40)=120, 5(24)=120, no these are proportions

30(5)=150, 15(10)=150, no, proportions

9(4)=36, 3(14)=42,  CHECK 9/14 is not 3/4

7(24)=14(12) true without multiplying it out; these are proportional

3.

4/16 = m/24

24(4) = 16 m

6(4)(4) = 16 m

m = 6

4.

t/16 = 40/50 = 4/5

5t = 16(4)=64

10t = 128

t = 12.8

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

the barter