SOLUTION: Mark travels 9 miles East and then 12 miles North. How far is Mark from the starting point?

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Question 818263: Mark travels 9 miles East and then 12 miles North. How far is Mark from the starting point?
Answer by balthazar612(14) About Me  (Show Source):
You can put this solution on YOUR website!
according to pythagoras theorem
X%5E2= %289%29%5E2+%2B+%2812%29%5E2%0D%0A%7B%7B%7BX%5E2= 81+ 144
X%5E2=225
sqrt%28X%5E2%29 = sqrt%28225%29
X= 15
So he will be 15 miles away from the start point