Is BrightStorm free??? I don't want to get billed for anything.

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yes. watching videos, dressing up your avatar, and answering/asking questions is free.the math HW checker is not free though. and neither are courses.

It is free. You won't get charged at all but you will get charged for the courses and the math checker. You get a free 7 day trial for the math checker so use it at your own risk because it is only for 7 days for the trial. If you want you can buy stuff like the courses. The courses will guide you through learning.

the videos on math and science are free. BUT the SAT/ACT/AP VIDEOS ARE NOT FREE.