2.4 Exercise 7

What is wrong with the following expressions? How can you correct them? (a) $C = \overset{\rightarrow}{A} \overset{\rightarrow}{B}$, (b) $\overset{\rightarrow}{C} = \overset{\rightarrow}{A} \overset{\rightarrow}{B}$, (c) $C = \overset{\rightarrow}{A} \times \overset{\rightarrow}{B}$, (d) $C = A \overset{\rightarrow}{B}$, (e) $C + 2 \overset{\rightarrow}{A} = B$, (f) $\overset{\rightarrow}{C} = A \times \overset{\rightarrow}{B}$, (g) $\overset{\rightarrow}{A} \cdot \overset{\rightarrow}{B} = \overset{\rightarrow}{A} \times \overset{\rightarrow}{B}$, (h) $\overset{\rightarrow}{C} = 2 \overset{\rightarrow}{A} \cdot \overset{\rightarrow}{B}$, (i) $C = \overset{\rightarrow}{A} / \overset{\rightarrow}{B}$, and (j) $C = \overset{\rightarrow}{A} / B$.