Question

you would summarize how functionalism, the conflict theory, or the interactionist perspective helps explain this social problem of homelessness.

Answer 1

First you have to make sure you are clear on all the terms.
http://www.google.com/search?hl=en&as_q=homelessness+functionalism+"conflict+theory"+"interactionist+perspective"+&as_epq=&as_oq=&as_eq=&num=10&lr=&as_filetype=&ft=i&as_sitesearch=&as_qdr=all&as_rights=&as_occt=any&cr=&as_nlo=&as_nhi=&safe=images

If you aren't sure of what functionalism is, or conflict theory, or interactionist perspective, then you'd better look them up!
http://www.answers.com

Let us know what you come up with.

Answer 2

Explain the problems of homelessness based upon the developmental, situational, and human needs perspectives