Answer:
Below.
Step-by-step explanation:
30 kg 500g + 28kg 700g
= 58kg + 1200g
= 59kg 200g.
Difference
= 30 kg 500g - 28kg 700g
= 2kg + 500 - 700
= 2kg - 200g
= 1kg 800g.
Uhhhh i cant answer this without details
Step-by-step explanation:

The question is asking to calculate and round of the value in to the greatest non zero place and base on the said number, I would say that the answer would be from 0.64 to 1. I hope you are satisfied with my answer and feel free to ask for more if you have question and further clarification