A vector A with components a, b, c can be written as (a, b, c) or in terms of unit vectors as ai + bj + ck. The letters i, j, k are the standard symbols for the unit vectors in the x, y and z directions.
<span>So if A = (3, 4, 5), you can also write A = 3i + 4j + 5k </span> <span>If B = (1, 1, 1), you can write B = i + j + k </span> <span>And then A - B is the vector whose components are the differences in each component: A - B = (3 - 1)i + (4 - 1)j + (5 - 1)k = 2i + 3j + 4k </span>
<span>So you need to know what the components of A and B are to answer this.</span>
The entire thing is equal to 180 degrees. so, 100+3x+x=180, which can be simplified to 100+4x=180. If we subtract 100 from both sides, we get 4x=80, 80 divided by 4 is 20, so x=20