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A running cheetah begins to slow down. For each meter the cheetah travels, its speed changes by −3.4−3.4 kilometers per hour. The cheetah travels a total of 21.5 meters. What is the total change in the cheetah's speed during this time?

A73.1

B71.9

C18.1

D-18.1

E-71.9

F. -73.1