Which two signs should be interchanged to make the below

I. 18p²- 21p + 6 = 0      

II. 16q² - 24q +9 = 0

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

Equation 1: 29x² - 137x + 108 = 0

I. 4x² -  15x + 9 = 0

II. 20y² -  23y + 6 = 0

Solve for x: |2x − 5| + |x + 1| ≤ 10.

I. 22x² - 97x + 105 = 0

II. 35y² - 61y + 24 = 0

I). 4p + 3q = 25

II). 5p + 2q = 26 

i) p²+p=56                                         

II) q²-17q+72=0

If the roots of the quadratic equation 5x² + 4x + 6 = 0 are α and β, then what is the value of [(1/α) + (1/β)]?

I. 6x² - 41x+13=0

II. 2y² - 19y+42=0

I. 12x² - 55x + 63 = 0

II. 10y² - 47y + 55 = 0