So is it better to submit both SAT and ACT?

Colleges and Universities A-Z University of North Carolina - Chapel Hill
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<p>Hoping some will reply.
I currently have an 1820 SAT (670M, 580CR, 570W, taking again tomorrow), while my ACT is a 31.
I know that Chapel Hill states that they view the SAT and ACT equally and will look at whatever is higher,
but would not submitting an SAT lower my chances? Or would submitting a low SAT hurt my chances even more?</p>

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<p>You only need to submit your highest. Brand does not matter.</p>