Evaluate: $\left(\sqrt{3x}\right)^2$ if x = 4

Evaluate: $\sqrt{-4x+12}$ if x = - 6

Evaluate: $\sqrt{\sqrt{3x}}$  if x = 27

Evaluate: $\sqrt[3]{2x}$ if x = 32

Evaluate: $\sqrt{\frac{10x}{5y}}$ if x = 10 and y = 5

Evaluate: $6x^{\frac{1}{2}}$ if x = 6

Evaluate: $\left(\sqrt{-8x+\left(-7\right)}\right)$  if x = - 4

Evaluate: $\sqrt[2]{64^x}$ if x = 2

$\sqrt{x+y-z}$ if x = 76, y = 24, and z = 19

Evaluate: √5x if x = 5