I want the answer of 13th and 15th questions

$$\begin{gathered} Dear Student, \\ Solution) \\ 13) \angle FBC={70}^0 \\ \angle FBC=x \{ Alternate angles\} \\ \Rightarrow x={70}^0 \\ Now, \angle ADG=\angle DFI \{Corresponding angles\} \\ \angle DEI={120}^0 \\ \angle DEI+y={180}^0\{Linear pair\} \\ y = {180}^0-{120}^0 \\ y={60}^0 \end{gathered}$$



Dear Kindly post question 15 in another thread.
Regards!