How do mass and volume relate to density?

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.

Show how to convert the temperature 84.7° c to kelvin. include all steps and label the final answer.