The following figure is the graph of 
, the cumulative number of customers served in a certain store during business hours one day, as a function of the hour of the day. About when was the store the busiest? 
Definitions:
Complex Ideas
Thoughts or concepts that are intricate and composed of multiple interconnected elements, often requiring significant understanding or analysis.
Spoken Sounds
The auditory elements or phonetic units used in oral communication to convey language and meaning.
Telegraph Lines
Historically significant communication system that transmitted electrical signals over wires between distant locations to convey messages.
Electrical Pulses
Rapid bursts of electrical energy that are used in various applications, from medical treatments to electronic devices.
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