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Math·Geometry and Trigonometry·Right triangles and trigonometry

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In right triangle $ABC$, angles $A$ and $B$ are acute, side $AC$ has a length of $28.2$, and $\tan B=\frac{1}{3}$. What is the length of side $BC$, rounded to the nearest tenth?

A

$795.2$

B

$84.6$

C

$9.4$

D

$5.3$