26. [-/4 Points] DETAILS SCALCET9 12.2.022. Find a + b, 4a + 2b, lal, and la = bl. (Simplify your vectors completely.) a = (4, 1, -8), b = (7, -2, 1) 4a + 2b lal= la - bl Need Help? Road it Submit Answer 27. [-/1 Points] DETAILS SCALCET9 12.2.024. Find a unit vector that has the same direction as the given vector. -6i + 4j - k Need Help? Read It Submit Answer 28. [-/2 Points] DETAILS SCALCET9 12.2.041. Find the unit vectors that are parallel to the tangent line to the parabola y = x2 at the point (6, 36) smaller i-component larger i-component