2.3 Exercise 10

Given the vectors in the preceding figure, find vector $\overset{\rightarrow}{R}$ that solves equations (a) $\overset{\rightarrow}{D} + \overset{\rightarrow}{R} = \overset{\rightarrow}{F}$ and (b) $\overset{\rightarrow}{C} - 2 \overset{\rightarrow}{D} + 5 \overset{\rightarrow}{R} = 3 \overset{\rightarrow}{F}$. Assume the +x-axis is horizontal to the right.