To find the slope of the arithmetic sequence, we need to determine the difference between the number of muffins baked on consecutive days.
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From day one to day two: \( 11 - 5 = 6 \)
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From day two to day three: \( 17 - 11 = 6 \)
The common difference, or slope of the sequence, is \( 6 \).
So, the answer is \( 6 \).