Matlab!!!

Help me!!

Task 10: Define four points P (2,-1,3), Q-(0,7,9), R (4, -9,-3) and S-(7,-6,-6) and then with two subtractions and one dot product within a single compound Matlab command show that the line through P and Q is perpendicular to the line through R and S. Task 11: Define two points P = (1,-2,3) and Q = (2,-1,4) and one vector 2i + 2j + 3k and then with one subtraction and one dot product within a single compound Matlab command show that is not contained in the plane containing P and normal to n. Task 12: Define four points P = (5,0,2), Q = (1,1,1), R = (0,1,-2) and S (1,-2, 10) and then with five subtractions, two cross products and one dot product within a single compound Matlab command find the distance from S to plane containing the other three points