There are some free services that will help you with a few questions, but if you have a lot of questions, you will have a tough time finding someone to "help" you through them all for free. Most of the people who answer questions there are trying to help you to learn and will not just do your homework for you!
And there is no guarantee you'll get the right answer to your homework question.
And you probably also know that if you're searching for the answer to a specific question, just type double quotes around your search query.
For example: suppose you are searching for an answer to this question...
You don’t want to use an incorrect answer key - no way!
As a tutor, I try to ask students to learn the material and ask me questions that they are having trouble with. Does a guidance counselor ever use the formula for an ellipse or convert grams to moles or calculate the trajectory of an arrow shot from a bow at an angle of 33.2 degrees above the horizon with an initial speed of 42.8 m/s? So while some people might look down on homework help or homework cheating, I don't see it as a huge sin and those who do can jump in a lake (with piranhas! I warn students that they typically need to know the material to pass their class exams, so please don't view this as a complete "get out of jail free card".
To narrow your search, put double quotes around the question.
Sometimes the words of the question might stay the same, but the numerical values might change.
However there are screen capture programs made that can override this. You just have to know how to outsmart the computer.
The quick and easy way around this is to take a picture with your phone. If your school makes you use a secure browser (Like Respondus Lockdown Browser) when doing your online work so that you cannot Google or email or chat with a tutor, then you might need to use a 2nd computer.