Pre-Calc ... need help fast

I need help writing an equation for a Sine Wave... I have 3 coordinates, but I can't get the eq. right... (4, 25), (7, 83), (10, 25). If anyone can help, I will be more than grategull. My group bailed on me. \m/

25 is the lowpoint and 83 is the high point. Thanks to anyone who can help!

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