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3. Determine the intersection of the three planes and describe the solution geometrically: [C f6} n1:x+3y+225= n2:2x-y-w4z4=D n314x3y+z+3= Thinking! Inquiry: l. [T #4] Two lines: with equations F = (1, 2, *4) 4- t0: 4* 1, 3k + 1, k 3),t E R andx = 2- 3111, y =1-10m, z = 3 5111, m E R, are given. Determine a value for k if these lines are pemendicular. 2. [1' :15] [f if and ii are two unit vectors and the angle between them is 60" calculate (4?? F)' .(351' + 25)