Consider the following. r(t) = (7t)i + (4t − 3)j + 6tk, P(6, 1, 6) (a) Find the arc length function s(t) for the curve measured from the point P in the direction of increasing t. s(t) = Reparametrize the curve with respect to arc length starting from P. (Enter your answer in terms of s.) r(t(s)) = (b) Find the point 4 units along the curve (in the direction of increasing t) from P. (x, y, z) =

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