Hello, i need with these 3 problems.

What percent of the circle below is shaded?

Can you me with this question? i'll reward *30 points i just need with this one question so that i could solve the others. * edit: i originally set up the question to reward 30 points, but for some reason i can only reward 15. if you don't get 30, then i'm sorry. i'm still kind of new to this site

If the line in the graph is shifted up two units which is the equation of the new line