(a) Find the arc length function for the curve measured from the point P in the direction of increasing t and then reparametrize the curve with respect to arc length starting from P, and (b) find the point 4 units along the curve (in the direction of increasing t) from P. 13. rstd − s5 2 td i 1 s4t 2 3d j 1 3t k, Ps4, 1, 3d