x is 14.3
[tex] \frac{x}{ \sin(a) } = \frac{y}{ \sin(b) } [/tex]
the right angle is 90 degrees, so sin(a) is 90
[tex] \frac{x}{ \sin(90) } = \frac{9}{ \sin(39) } [/tex]
multiply sin(90) on both sides to give:
[tex]x = \frac{9}{ \sin(39) } \times \sin(90) [/tex]
x is 14.3
