I need help with these problems please, and please make it legible.

Find the length and direction (when defined) of u xv and v x u. u = - 6i, v =7j . . . . . The length of u x v is. (Type an exact answer, using radicals as needed.) Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. O A. The direction of uxv is ( i + (j + ( )k. (Type exact answers, using radicals as needed.) O B. The direction of u x v is undefined. The length of v xu is. (Type an exact answer, using radicals as needed.) Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. O A. The direction of v xu is ( i + ( j + ( )k. (Type exact answers, using radicals as needed.) O B. The direction of v x u is undefined.Find the area of the triangle determined by the points P, Q, and R. Find a unit vector perpendicular to plane PQR . P(2, - 2, - 1), Q( - 1,0, -2), R(0, - 1,2) . . . . . The area of the triangle is . (Type an exact answer, using radicals as needed. ) Choose the unit vector perpendicular to plane PQR. O A. -(11i + 7j + k) -(i + 2j + k) 31 19 O B. 16 O C. (7i + 11j + k) OD. -(1+j) 31 19 12