What are the four rules for significant figures

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?