Determine whether the following curve uses arc length as a parameter. If not, find a description that uses arc length as a parameter. r(t) = (5? 67 2/15), for 1sts4 Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. O A. r(t) does not use arc length as a parameter. A description of the curve that uses arc length as a parameter is r(s) = ( D for (Type exact answers, using radicals as needed. Use 0 for the lower bound of s.) O B. r(t) uses arc length as a parameter.

Q: Answer d

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Q: Please answer D

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A: The solution is given below:

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Q: (b) 4x = 2 (mod n), n = 6 (c) 4x = 3 (mod n), n = 7

A: