(1 point) Use the geometric definition of the cross product and the properties of the cross product to make the following calculations. (a) ( ( + k ) x j ) x k = (b) ( i + )) x ( i xj) = (c) 3 k X (k + ]) = ((+ j xi - j) =(1 point) Find the area of the parallelogram with vertices A(-1, 2, 3), B(0, 4, 8), C(1, 1, 5), and D(2, 3, 10). Area:(1 point) Let P = (0, 0, 0), Q = (1, 1, -1), R = (2, -1, 1). Find the area of the triangle POR. area = Let T = (5, -5,7), U = (-2, 4, 10), V = (-5,-8, -2). Find the area of the triangle TUV. area =