If BC=8.3, CD=6.7, and AD= 11.6, find AB to the nearest tenth.

Given the following question:
BC = 8.3
CD = 6.7
AD = 11.6
Find AB:
[tex]\begin{gathered} d=11.6 \\ d=\frac{11.6}{a} \\ c=\frac{(6.7a)}{11.6} \\ bc=8.3(\frac{6.7a}{11.6})=14.3705 \\ 14.3705 \\ 7>5 \\ 14.4 \end{gathered}[/tex]Your answer is the first option.