Posted by hiba on Monday, February 27, 2012 at 11:03am.
Miguel is driving his motorboat across a river. The speed of the boat in still water is 10 mi/h. The river flows directly south at 3 mi/h. If Miguel heads directly west, what are the boat’s resultant speed and direction? Round answers to the nearest tenth.

geometry  Steve, Monday, February 27, 2012 at 2:04pm
you have a right triangle with legs 3 and 10.
The resultant speed is the hypotenuse: √(36+100) = √136 = 11.7
direction is W θ S
where tanθ = 3/10, so that's W16.7°S

geometry  Irene, Sunday, March 11, 2012 at 4:03pm
the resultant speed is the hypotenuse
9+100=109
√109=10.4
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