1. The problem statement, all variables and given/known data Given the following vector components of vectors C and D: Cx = 8.10, Cy = -5.40, Cz = -7.90, Dx = 4.40, Dy = -2.50, Dz = 4.50, find the x, y, z components of their sum. 2. Relevant equations No relevant equations that I know of.... 3. The attempt at a solution I am lost completely. I do understand using (x,y) components, as well as use of the Pythagorean theorem for right triangles, etc.... The z component is throwing me off completely. Do I use the (-) as an indication of direction? Does Z represent a hypotenuse? Im so confused.