If you are just adding those two decimals together, the answer would be 100.871.
83.971
+ 10.900 (make believe there are two zeros)
—————-
100.871
Answer: Third option.
Please, see the detailed solution in the attache file.
Thanks
4 square root of 3 over 9
It would just be 2 teaspoons
We can re-group them to add more easily.
300 + 400 = 700
42 + 16 = 58
700+58 = 758
Answer: 758