Not only in converting temperatures I think, we always use significant figures every time we want to make some experimental report using the exact data from our experiment. If that isn't experimental report ( some exercise/questions from your textbook) it's not necessary
Answer:
Joint application development
Explanation:
Joint application development is a computer based system used for development process. It interface between the users and designer of the system in development.
The answer is B, time is always the independent variable