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4-141.

The annual cycle of daily high temperatures in Cabanaville is shown in the graph below from January 1st to December 31st. The $x$-axis is marked in segments of $30$ days and the $y$-axis represents temperature in °F.

1. Approximately when is Cabanaville at its hottest? The coldest? How can you tell?

This is a temperature graph. Change in temperature is a rate. How is rate shown on a temperature graph? How about the 'fastest' rate?

2. When is the temperature changing the fastest? What is this called?

This is a temperature graph. During what month was temperature the highest?