Chapter 3 - Vectors and Coordinates Systems - Stop to Think 3.3 - Page 72: 1

$$C_x=-4cm$$ $$C_y=2cm$$

Each component of the vector C corresponds to one of the axis, x and y. $C_x$ can be found by finding the different between the final and initial x-coordinates of the vector $-3 - 1 = -4$. The same is done for $C_y$ using the y-coordinates $1 - -1 =2$.