Jose buys a new moped. He travels 3 km south and 4km east. How far does he need to go to get back where he started?
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A {}^{2} = b {}^{2} + c {}^{2}
a {}^{2} = 3 {}^{2} + 4 {}^{2}
a {}^{2} = 9 + 16 = 25 a=5
he needs to travel 5km
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