Answer: Karina and Lucas are 480 feet apart on the number line.
Explanation:
Since we have given that
A number line with a point for Lucas at coordinate 240.
A number line with a point for Karina at coordinate -240.
So, Number of feet that Karina and Lucas apart on the number line is given by
![240-(-240)\\\\=240+240\\\\=480\ feet](https://img.qammunity.org/2019/formulas/mathematics/college/jy1t4fzqqhll8pylw2bezo34wj5gebyix4.png)
Hence, Karina and Lucas are 480 feet apart on the number line.