i was absent for days due to sickness and we have a homework. i can't understand the book itself. please help me by explaining on how to get the answer to these questions.. thank you.

this is the figure:

these are the questions

Line r intersects lines x and y

1. Give as many vertical angles as you can see in the figure

if <1=30deg, give the measure of

2.) <2

3.) <3

4.) <4