Look at the following figure and find the values of $x, y, z.$

In the figure, $m\parallel n$ and $p$ is a transversal. Find the values of $x,y,z.$

Prove that lines $l$ and $m$ are parallel to each other in the following figure.

In the given figure, $\angle ABE=15°,\angle ABD=80°,\angle EBC=75°$,$\angle DBC=\_\_\_\_\_°$.