Which component amplifies or switches electronic signals

I.  p²= ∛1331

II. 2q²  - 21q + 55 = 0

I. x² + 4x + 4 = 0

II. y² - 8y + 16 = 0

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

I. 6x² + 37x + 45 = 0

II. 3y² - 11y + 6 = 0

Equation 1: 2x² - 21x + 54 = 0

Equation 2: 4y² - 23y + 15 = 0

I. (x^13/5 ÷7) = 5488 ÷ x^7/5

I. 35 y² + 58 y + 24 = 0

II. 21 x² + 37 x + 12 = 0

I.8^(x+3)+ 8^(-x)=72 

II. 5^(y+5)+ 5^(-x)=150 

I. 35x² + 83x + 36 = 0

II. 42y² + 53y + 15 = 0

I. 6x² - 13 x + 6 = 0

II. 15 y² + 11 y - 12 = 0