Reparametrize the curve with respect to arc length measured from the point where $t = 0$ in the direction of increasing $t$.
$$\mathbf { r } ( t ) = ( 3 + 3 t ) \mathbf { i } + ( 4 + 9 t ) \mathbf { j } - ( 6 t ) \mathbf { k }$$

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The Answer of Reparametrize the curve with respect to arc length measured from the point where $t = 0$ in the direction of increasing $t$.
$$\mathbf { r } ( t ) = ( 3 + 3 t ) \mathbf { i } + ( 4 + 9 t ) \mathbf { j } - ( 6 t ) \mathbf { k }$$

Reparametrize the Curve with Respect to Arc Length Measured from the Point