Vector addition in Berkley Review

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Drrrrrr. Celty

Osteo Dullahan
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So basically I'm doing the problem and getting a North vector of = 3200, a West Vector of 2400.
So Ry =3200, Rx = 2400.
inverse tan = Ry/Rx. However the book answers with Rx/Ry and gives an answer of 37 degrees. as opposed to 53 degrees. I personally don't understand why the book is doing it this way. Anyone understand? It's page 15 of Chapter 1 in physics 1.
 
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