Chapter 3, Problem 20PCE

Consider the vectors $\stackrel{\to }{\text{A}}$ and $\stackrel{\to }{\text{B}}$ shown in Figure 3-42. Which of the other four vectors in the figure ( $\stackrel{\to }{\text{C}}$, $\stackrel{\to }{\text{D}}$, $\stackrel{\to }{\text{E}}$, and $\stackrel{\to }{\text{F}}$) best represents the direction of (a) $\stackrel{\to }{\text{A}}\text{+}\stackrel{\to }{\text{B}}$, (b) $\stackrel{\to }{\text{A}}-\stackrel{\to }{\text{B}}$, and (c) $\stackrel{\to }{\text{B}}-\stackrel{\to }{\text{A}}$?