Please give me some guidance on these problems as I am stuck doing them for entire day. Thank you for helping me!

This Question: 1 pt 6 of 9 (0 complete) Find the length of the following two-dimensional curve. r(t) = (9 cost,9 sint), for Osts n The length of the curve is]. (Type an exact answer, using it as needed.) Enter your answer in the answer box. Type here to search 9 wThis Question: 1 pt 8 of 9 (0 complete) Find the unit tangent vector T and the curvature k for the following parameterized curve. r(t) = (7 cos 34,7 sin $1) for Ost= ? T= (D K =] Enter your answer in each of the answer boxes. Type here to search 9 w ?111is Question: 1 pt 4 2 of6(1 complete)v ) Find the equation for [he plane tnreugh [he points PO': 74,3, 7 3), 00(5, 7 3'5), and Ro(2' 7 3,1), The equation of the plane is Enter your answer in the answer box. a ,0 Type here to search This Question: 1 pt 4 of 6 (1 complete) Find an equation of the line where the planes Q and R intersect. Q: - 2x - 3y + 4z = 1; R: X + y+ z= 1 Choose the correct answer below. O A. An equation of the line is given by x = t, y = -3 -7t, z= 4 + 6t, where - co