Choose a number line below to model the situation: The temperature outside dropped 15° and then rose 15°.

A vertical number line is shown with labels at 0 and negative 15. A red arrow (labeled dropped 15 degrees) begins at 15 and ends at 0. A blue arrow (labeled rose 15 degrees) begins at 0 and ends at 15.
A vertical number line is shown with labels at negative 15, 0, and 15. A red arrow (labeled dropped 15 degrees) begins at 0 and ends at negative 15. A blue arrow (labeled rose 15 degrees) begins at 0 and ends at 15.
A vertical number line is shown with labels at negative 15, 0, and 15. A red arrow (labeled dropped 15 degrees) begins at 15 and ends at 0. A blue arrow (labeled rose 15 degrees) begins at negative 15 and ends at 0.
A vertical number line is shown with labels at 0, negative 15, and negative 30. A red arrow (labeled dropped 15 degrees) begins at 0 and ends at negative 15. A blue arrow (labeled rose 15 degrees) begins at negative 15 and ends at negative 30.