URGENT!! PLEASE HELP ME WITH THE BELOW VECTOR QUESTIONS!!!

PART C: THINKING 6. Determine if the vectors a = [-1, 5, 3], b = [-2, 4, 7], and c = [10, 7, 1] are coplanar. [4] 7. Given a = [4, 7, 1] and b = [-3,1, 5]: a) Calculate the angle between a and b. [3] b) If c = [3, -4, t], find t so that a and c are perpendicular. [3]8. Calculate the area of the parallelogram whose adjacent sides are: {i = [6, 3, 2] and E = [1, 3, 1] [4] 9. The points A[1, 1, 1], B[2, 0, 3], and C[3, 3, 4]. Show that this triangle is a right-angle triangle. [3] 10. Determine the following: a) Determine the vector equation of the plane that contains the following two lines L1: 3\" = (2, 3, 5) + t(3,1,5).teR [2] L2: r = (2, 3, 5) + s(0,4,3). 56R b) Determine the corresponding Cartesian equation. [5]