my restrictions code doesn't work but i know i have the right passcode

Hello pbgilbert,
Thank you for using Apple Support Communities. It's my understanding your experiencing issues with the Restrictions passcode on your iPad. I know this can be concerning, especially if you believe you're entering the right code. I am happy to help.
If your passcode isn't being accepted you'll need to erase your device and then set it up as a new device to remove the passcode. Restoring from a backup won't remove the passcode. The following links provide steps on how to erase your device and set up as new and additional information on Restrictions passcodes:

If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled
Use Restrictions on your iPhone, iPad, and iPod touch
Have a fantastic day!