The problem states, r(t)=(6t,3t^2,3log(t)), find the length from the points (6,3,0) and (24,48,3log(4)). I thought it would be the integral from 1-4 of the square root of the derivatives of each squared, added together. Seems that this isn't correct.

My derivatives are r'(t)=(6,6t,3/(tln10))

My final answer is 48.928761 but this was NOT correct. Can someone offer some help here?