After an airplane take off, it travels 10.4 km west, 8n7 km north, and 2.1 km go. How many far is it from the takeoff point?
l=10.42+(8.7+2.1)2≈15(km)l=\sqrt{10.4^2+(8.7+2.1)^2}\approx15(km)l=10.42+(8.7+2.1)2≈15(km) . Answer
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