ANSWER :
x = 8.5
EXPLANATION :
Using sine law :
[tex]\frac{\sin A}{a}=\frac{\sin C}{c}[/tex]
A = 28 degrees
a = x
C = 83 degrees
c = 18
The value of x will be :
[tex]\begin{gathered} \frac{\sin28}{x}=\frac{\sin83}{18} \\ \\ \text{ Cross multiply :} \\ \\ 18\sin28=x\sin83 \\ \\ x=\frac{18\sin28}{\sin83}=8.51\sim8.5 \end{gathered}[/tex]
