Chapter 7 - Applications of Trigonometry and Vectors - Section 7.4 Vectors, Operations, and the Dot Product - 7.4 Exercises - Page 330: 70

$0\textbf{i}-4\textbf{j}$ or $-4\textbf{j}$

In the vector notation $\langle 0,-4 \rangle$, $0$ represents the x-component whereas $-4$ represents the y-component. Therefore, this vector can be written as $0\textbf{i}-4\textbf{j}$ or $-4\textbf{j}$.