Answer
$50^{\circ}$ counterclockwise from the x-axis
Work Step by Step
From the previous question 46a, we found vector a + vector b = 2.71 $i$ + 3.28$j$
Let vector a + vector b = vector c
$\theta = cos^-1 (\frac{vector C_x }{|vector C|}) $
$=cos^-1 ( \frac{2.71}{4.25}) = 50.3^{\circ} \approx 50^{\circ}$
