The components of vectors vec$(A)$ and vec$(B)$ are given as follows:

$A_x=-1\mathrm{.}3,B_x=-8\mathrm{.}5$

$A_y=2\mathrm{.}5,B_y=3\mathrm{.}7$

What is the magnitude of $3$vec$(B)+2$vec$(A)?$