Question: Let r(t)=(5-t, 4t - 3, 7t) and P(4, 1, 7). (a) Find the arc length function s(t) for the curve measured from the point

Let r(t)=(5-t, 4t - 3, 7t) and P(4, 1, 7). (a) Find the arc length function s(t) for the curve measured from the point P in the direction of increasing t. (b) Reparametrize the curve with respect to arc length starting from P.
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