When the area of a square is expanded by four times, how many times is its side length? How many times is its area expanded by nine times? How many times is n (n is greater than 0)? I am a junior one

When the area of a square is expanded by four times, how many times is its side length? How many times is its area expanded by nine times? How many times is n (n is greater than 0)? I am a junior one

The area of a square is expanded to 4 times of the original, and its side length becomes √ 2 = 2 times of the original
The area is 9 times of the original, and the side length is 3 times of the original √ 9
The area is enlarged n (n is more than 0) times, and the side length is √ n times of the original