. A compound contains atoms of sulfur and iron. There are 3.6 X 10^20 atoms of iron in the compound. Divide the number of iron atoms by 1.8 X 10^-4 to find the number of sulfur atoms in the compound.

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.