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gus
gas
gps
gis

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The Global Positioning System (GPS) is a system of around 30 satellites revolving around the Earth at an elevation of 20,000 km. Once it has data on how far apart at slightest three satellites are, your GPS receiver can pinpoint your position applying a method termed trilateration.

Firstly, the signal of time is transmitted from a GPS satellite at a delivered position. Consequently, the time interval between GPS time and the point of time clock which GPS receiver acquires the time signal will be measured to produce the range from the receiver to the satellite. The equivalent method will be performed with three different possible satellites. It is likely to estimate the location of the GPS receiver from the length from the GPS receiver to three satellites.

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the correct answer is "c: merchants" and "e. soldiers".

the song dynasty was known as the first government in the world to introduce paper currency. it was also the first chinese government which established a permanent standing navy. finally, the first compass was introduced during this period of government.

all of these innovations heavily affected commerce in a positive way. printed money dynamize commerce within the borders of the empire due to an easier way to quantify value during the trade. the introduction of the compass trade routes to be faster. finally, the introduction of a standing navy regulate trade routes.

regarding military affairs, gunpowder was created during this period. this was a tremendous improvement that was widely utilized by the military in order to innovate in the manufacturing of weapons.