13
QuizMultiple Choice
Dot Product and Work — Unit test
Question 13 of 25 • Precalculus
Let |r| = 6 at an angle of 30° and |s| = 11 at an angle of 225°. Which expression represents |r – s|?
Answer
A
StartRoot 6 squared + 11 squared minus 2 (6) (11) cosine (15 degrees) EndRoot
B
StartRoot 6 squared + 11 squared minus 2 (6) (11) cosine (45 degrees) EndRoot
C
StartRoot 6 squared + 11 squared minus 2 (6) (11) cosine (165 degrees) EndRoot
D
StartRoot 6 squared + 11 squared minus 2 (6) (11) cosine (255 degrees) EndRoot