The South Korean won is the official currency of which

I. x²= 961 

II. y= √961

I: x² - 10x + 21 = 0  

II: 4y² - 16y + 15 = 0

I. 96y² - 76y – 77 = 0

II. 6x² - 19x + 15 = 0

A and B are the roots of equation x² - 13x + k = 0. If A - B = 5, what is the value of k?

I. 10x² + 33x + 9 = 0

II. 2y² + 13y + 21 = 0

Equation 1: x² - 250x + 15625 = 0

Equation 2: y² - 240y + 14400 = 0

I. 7x² + 27x + 18 = 0

II. 19y² - 27y + 8 = 0

I. 14p² – 135p + 81 = 0

II. 7q² – 65q + 18 = 0

Solve the quadratic equations and determine the relation between x and y:

Equation 1: x² - 34x + 288 = 0

Equation 2: y² - 29y + 210 = 0

I. 8a² – 22a+ 15 = 0

II. 12b² - 47b + 40=0