Which theory is generally included under micro

I. y/16 = 4/y 

II. x³ = (2 ÷ 50) × (2500 ÷ 50) × 4² × (192 ÷ 12)

Between what values of x is the expression 19x - 2x² - 35 positive?

I. 2x² + 15 x - 27 = 0

II. 3 y² + 25 y - 18 = 0

I. 84x² - 167x - 55 = 0

II. 247y² + 210y + 27 = 0

I: x² - 10x + 21 = 0  

II: 4y² - 16y + 15 = 0

Quantity I: The cash price of a notebook is Rs. 100 but is can also be purchased on 11 monthly equal instalments of Rs. 10 each. Find rate of S.I.?

I. 6x² + 19x + 10 = 0

II. y² + 10y + 25 = 0

I). 4p + 3q = 25

II). 5p + 2q = 26 

I. x² + 11x + 30 = 0

II. y² + 17y + 72 = 0