4
QuizMultiple Choice
Dot Product and Work — Unit test
Question 4 • Precalculus
Let a =⟨–7, 3⟩ and b =⟨–2, –12⟩, and c = a + b. What is the magnitude and direction angle of c?
Answer
A
|c| = 18; θ = 135°B
|c| = 18; θ = 225°C
|c| = ; θ = 135°
D
|c| = ; θ = 225°