Q. 2

P = \frac{12}{\sqrt{q}}

  1. P is inversely proportional to the square root of q

  2. 4 = \frac{12}{\sqrt{q}} \sqrt{q} = \frac{12}{4} \sqrt{q} = 3 q^{\frac{1}{2}} = 3 q = 3^2 q = 9