The answer to “If what must be true about the directions and magnitudes of and if C = A + B ? What must be true about the directions and magnitudes of and if C = 0?” is broken down into a number of easy to follow steps, and 34 words. Since the solution to 18DQ from 1 chapter was answered, more than 236 students have viewed the full step-by-step answer. The full step-by-step solution to problem: 18DQ from chapter: 1 was answered by Patricia, our top Physics solution expert on 05/06/17, 06:07PM. University Physics was written by Patricia and is associated to the ISBN: 9780321675460. This full solution covers the following key subjects: Directions, magnitudes, must, true. This expansive textbook survival guide covers 26 chapters, and 2929 solutions. This textbook survival guide was created for the textbook: University Physics, edition: 13.