Precalculus was written by and is associated to the ISBN: 9780618643448. This full solution covers the following key subjects: . This expansive textbook survival guide covers 85 chapters, and 8847 solutions. The full step-by-step solution to problem: 19 from chapter: 6.4 was answered by , our top Calculus solution expert on 03/15/18, 04:43PM. This textbook survival guide was created for the textbook: Precalculus, edition: 7. Since the solution to 19 from 6.4 chapter was answered, more than 205 students have viewed the full step-by-step answer. The answer to “In Exercises 1924, use the dot product to find the magnitude of u.” is broken down into a number of easy to follow steps, and 13 words.