Question

assume you had a solution that contained a mixture of a silver ions and stronium ions. come up with three different reaction plans that would allow you to precipitat either the silver ion or strontium ion, but the other ion would remain in solution

Answer 1

This question is designed to help you use the solubility tables. Here is a simplified table of solubilities.
http://www.files.chem.vt.edu/RVGS/ACT/notes/solubility_rules.html

As an example, AgCl is not soluble in water but SrCl2 is. SrCrO4 is soluble in water but Ag2CrO4 is not. Now you think of the third one.