Easy Math Question: Katrina hikes 5 miles north, 7 miles east, and then 3 miles...

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...north again ... ? Katrina hikes 5 miles north, 7 miles east, and then 3 miles north again. To the nearest tenth of a mile, how far, in a straight line, is Katrina from her starting point?

Please help me! And no mean comments like, "Do your own homework." I really need help. Explanations are most welcome. :)

Thank you!
 
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