Which of the following is not a factor of production?

I. x³ = 1728

II. y² – 15y + 56 = 0

I. 81x - 117√x + 40 = 0

II. 81y - 225√y + 136 = 0

I. 88x² - 13 x – 56 = 0

II. 15 y² + 41 y + 28 = 0

I. 64x² - 64x + 15  = 0     

II. 21y² - 13y + 2  =0

I.8^(x+3)+ 8^(-x)=72 

II. 5^(y+5)+ 5^(-x)=150 

I. p²+ 2p – 8 = 0 II. q² – 5q + 6 = 0

I. 25p + 2(2p² – 1) = 8(p + 5)

II. 8q² + 35q – 78 = 0

I. x²– 9x + 18 = 0

II. y²– 5y + 6 = 0

I. 2x²– 25x + 33 = 0

II. 3y²+ 40y + 48 = 0

I. 165x² + 97x + 10 = 0

II. 117y² - 163y + 56 = 0