I need help with these problems please, and please answer all parts of the problems.

Find the curve's unit tangent vector. Also, nd the length of the indicated portion of the curve. 2 r(t)=5ti+[]t3/2k, Osts11 Next question The curve's unit tangent vector is ) I + )I+( (Type exact answers, using radicals as needed.) Find the curve's unit tangent vector. Also, nd the length of the indicated portion of the curve. r(t)=6t3i -2t3j +3t3k 1st52 Next question The curve's unit tangent vector is ) I + ( J+( (Type an integer or a simplied fraction.)