Thanks in advance

According to the laws of geometry,

Angle B is one half of arc AC

\((4x-3.5)\cdot2=4x+17\)

\(8x-7=4x+17\)

\(4x=24\)

\(x=6\)

Plugging this into 4x + 17, we get:

\(4\cdot6+17=\boxed{41}\)

I hope this helped,

Gavin