2.4 Exercise 18

For the vectors in the earlier figure, find (a) $\left(\overset{\rightarrow}{A} \times \overset{\rightarrow}{F}\right) \cdot \overset{\rightarrow}{D}$, (b) $\left(\overset{\rightarrow}{A} \times \overset{\rightarrow}{F}\right) \cdot \left(\overset{\rightarrow}{D} \times \overset{\rightarrow}{B}\right)$, and (c) $\left(\overset{\rightarrow}{A} \cdot \overset{\rightarrow}{F}\right) \left(\overset{\rightarrow}{D} \times \overset{\rightarrow}{B}\right)$.