1.The Inca were centered in what modern day country? 2.The Inca were able to keep in close contact with areas within its massive empire thanks to? 3.The purpose of quipu was to?

The correct response for Question 1 is Peru.  The correct response for question 2 is a massive road system. The correct response for question 3 is to keep records of trade.

Explanation:

The center of the Incan empire was in modern-day Peru. The city of Cusco is believed to have been the seat of the Incan empire, although when Pizarro first met with the Incan ruler Atahualpa at the time, he met with him in Cajamarca, in the Northern Andes region of Peru.  There was a conflict for Incan leadership at the time and Atahualpa's half brother Huáscar, was seated in Cuzco. Atahualpa had his brother killed in an effort to control all of the Incan empire but the Spanish soon came and took Atahualpa prisoner and killed him as well. The Incas were successful at uniting an empire through the mountainous regions of South America thanks to Quapaq Ñan, the Incan road system that administrators would travel on foot in order to gather tribute from communities they controlled.  It is believed that quipus were used as an accounting system to keep count of resources like livestock and agricultural products. Quipus are elaborate series of knots on strings that have been associated with Incan archaeological sites.  

answer; not notated (at least, not in the traditional sense) and includes many improvised sections and solos;