The first one would be D, and the second one, the question doesn't make sense. Can u show us full question.
Answer: 
Step-by-step explanation:
Step 1) Add 4 to both sides: 

31 minus 7 is 24. 24 divided by 3 is 8. The number is 8.
0.37 inches on each necklace or 37/100.
You just need to do 1.48 divided by 4.
Hope this helps !!!
You should go to sleep soon you have school tomorrow!!
Also make sure you ate today !