I know how to figure out whether it's decomposition, synthesis, etc.. but I'm not sure what to do after that.

Can you show me (step by step) how to do this problem? Or really any problem..

Calcium phosphate + aluminum sulfate

Unfortunately I was never good at cheistry, but I replied because no one may respond since we don't do homework for you on this site. If you want to start the problem and re-post once your stuck and have thought about it for a while I'm sure someone who is good at chemistry will help you to the next step.

I'm not asking anyone to do it for me. I was simply wanting someone to show me how to do a problem. I have thought about it and the farthest I can get is naming it.