Question

Please help , I don't understand these.

-4/5 - 5/6 = (Points : 1)
-1/30
-49/30
-9/30

Question 4. 4. 1/2 - (-5/9) = (Points : 1)
6/9
6/18
19/18

Question 5. 5. -1.3 + -3.8 = (Points : 1)
5.1
-5.1
2.5

Question 6. 6. -2.87 + 4.2 = (Points : 1)
1.33
-1.33
-7.07

Question 7. 7. 82.5 - -89.4 = (Points : 1)
-7
7
171.9

Question 8. 8. -5.89 - 6.1 = (Points : 1)
-0.21
11.99
-11.99

Question 9. 9. Evaluate -6.25 - |4.2 - 8.1|. (Points : 1)