18
QuizMultiple Choice
Dot Product and Work — Unit test
Question 18 of 25 • Precalculus
Let |r| = 17 at an angle of 40° and |s| = 14 at an angle of 160°. Which expression represents |r + s|?
Answer
A
StartRoot 17 squared + 14 squared minus 2 (17) (14) cosine (40 degrees) EndRoot
B
StartRoot 17 squared + 14 squared minus 2 (17) (14) cosine (60 degrees) EndRoot
C
StartRoot 17 squared + 14 squared minus 2 (17) (14) cosine (10 degrees) EndRoot
D
StartRoot 17 squared + 14 squared minus 2 (17) (14) cosine (120 degrees) EndRoot