Your cell phone could ring in class without your instructor hearing it because

The correct answer is: you activated the silent mode.

Explanation:

The silent mode is an option most cell phone devices include and allows users to receive calls without others noticing it. What the silent mode does is to deactivate all the cell phone sounds such as ringtones, keypad tones or any other notification sound to avoid others hearing them. It is useful when an important call will be received and people are in meetings or public spaces.

During the Middle Kingdom period, Osiris became the most important deity in popular religion. The Middle Kingdom was followed by the Second Intermediate Period of Egypt, another period of division that involved foreign invasions of the country by the Hyksos of West Asia.

Their name, Heqau-khasut, translates as 'Rulers of Foreign Lands' (given by the Greeks as Hyksos), suggesting to some scholars that they were kings or nobility driven from their homes by invasion who found refuge in the port city of Avaris and managed to establish a strong power base during the decline of the 13th

Trade networks helped to diversify the economy and bring more wealth. With over 90% of the population working in the fields, agricultural products were a major source of production and wealth. ... Manufacturing of products including linen, beer, and war goods also flourished during the New Kingdom period.