On a cold winter morning, you check the temperature before heading out:

A thermometer reading -10 degrees.

Image by wynpnt via Pixabay (License)

Throughout the day, it feels like the weather has changed, so you check the thermometer again:

A thermometer reading 5 degrees.

Image by wynpnt via Pixabay (License)

Finally, when you head home, you glance at the thermometer one more time:

A thermometer reading -15 degrees.

Image by wynpnt via Pixabay (License)

What was the lowest temperature during the day?

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Type a concept, like “slope” or “photosynthesis”.

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