In order to find the distance between cities A and B, we can use the following formula for the distance d:
![d=\sqrt[]{(x_B-x_A)^2+(y_B-y_A)^2}](https://img.qammunity.org/2023/formulas/mathematics/college/rro2hty564btk7zmhiq7ekruwv7b3m9joa.png)
Observing the graph, we see that the given points are A(0, 0) and B(-2, 6).
Then, using the formula above, we find:
![d=\sqrt[]{(-2_{}-0_{})^2+(6_{}-0)^2}=\sqrt[]{(-2)^2+6^2}=\sqrt[]{4+36}=\sqrt[]{40}=6.32456](https://img.qammunity.org/2023/formulas/mathematics/college/nudca2m6nfffvg43khi8hfjlddqsi8jt0o.png)
Finally, we need to round the distance to the nearest tenth. Therefore, this distance is 6.3.