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Subtracting vectors

"The figure below (please see attached Word file) shows three vectors of lengths
A = 67.8, B = 39.5, and C = 47.0.
The angles are theta(a) = 28.8°
and theta(b) = 54.5°, and C points along
the negative y-axis. Determine the length of the vector A - C."

The book indicates that the equation for subtraction of vectors is simply "vector 2 - vector 1." But when I try that for this problem, I don't obtain the right answer (it's neither 20.8, nor -20.8). Can you show me how to do this problem?

Thank you!