Angle A is found by knowing tht angle sin a triangle add up to 180
A + B + C = 180 so
A = 180 - B - C
A = 180 - 68 - 46
A = 66
Use sine law, which says sinA / a = sin B / b
[tex]\displaystyle \frac{\sin A}{a} = \frac{\sin B}{b} \\
\frac{b\sin A}{a} = \sin B \\ \\
b = \frac{a \sin B}{\sin A} \\ \\
b = \frac{9 \sin 68}{\sin 66} \\ \\
b = 9.13[/tex]
b = 9.13
