Um, ram... the idea is that if you're going to try to answer the poster's question, you know how to come up with the answer. The asker is the one who doesn't know how to do it, or wants work checked, and the responder is the one who's supposed to know how to do it.
That said, we do have guidelines for posting homework that we do not just do work for students. We will check their work and guide them, we'll answers specific questions they have about it, etc. i.e. help them and explain stuff, but not just do it for them.
Are you under the impression that the person who posts the homework is also giving away the answers so that others can just grab the solution? No, no - this site is not here to do that - we consider that your work was assigned to you for a reason: for you to do and learn from. We'll help with the learning, but not the doing.
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