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You can't logout of vmathlive.
To "sign in" and to "log in" have the exact same meanings. Basically, these expressions mean for you to enter a site, usually by entering a pass word. This indicates that you are on the site or "on line".To "sign up" is basically asking whether or not you would like to join a site/forum by filling out a quick enrollment/sign up form including your username and pass word.
≈ and in case it does not show up properly on your browser, it looks like a double tilde or the equals sign wobbling up and down.
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Why algebra has a different multiplication sign is because they don't want to mix up the American multiplication sign with the variable x. So they use a centered dot for algebra instead of this: x.