Finding the Angle Between Vectors Not Centered at the Origin | Application

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Q. A researcher has mapped out 100 square kilometers in the Atlantic Ocean. She uses a Global Positioning System to track the movements of a tagged whale in the marked area. The researcher notes that the whale moved from a position of (2, 5) to (-3, 1) to (-7, 4) (all distances are in kilometres).

a) What vectors would represent the displacement of the whale?

b) What angle does the whale move through?