I am having some trouble with these questions

Find the unit tangent vector for the parameterized curve: r(t) = < 5 cos ( 6 t ), 5 sin ( 6 t ), 7 >, 0 t 2

Findc (x y z + y z) ds if C is the line segment from the point (1, 1, 2) to the point (2, 2, 1).