The vector $\textbf{i}$ represents 1 mile per hour east, and the vector $\textbf{j}$ represents 1 mile per hour north. Maria is jogging south at 12 miles per hour. One of the following vectors represents Maria's velocity, in miles per hour. Which one?

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Since $\textbf{j}$ represents 1 mile per hour north, $-\textbf{j}$ will represent 1 mile per hour south.