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Mathematics 9 Online
OpenStudy (anonymous):

Karina walks 19 minutes east to her friend’s house. Then she and her friend walk 10 minutes west to the bus stop. Using compass directions on a number line, which expression can be used to find how many minutes Karina’s house is from the bus stop? 19 + -10 -10 + -19 +19 + +10 +10 - +19

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