Evaluate the square root expression: √(9 + 4√5) =

Evaluate the mathematical expression: (5.21 × 6.32) − 2.9272 =

Simplify the expression: [9⁻² × 3⁵ × (5⁻²)³] / [(3⁻³)⁴ × 5⁴].

Evaluate: (8⁻¹ − 9⁻¹)⁻¹ ÷ (4⁻¹ − 9⁻¹)⁻¹ =

Calculate the square root of: [(0.081 / 0.0064) × (0.484 / 6.25) × (2.5 / 12.1)]

Evaluate: [(2.1)³ + (5.8)³] / [(2.1)² - 2.1 × 5.8 + (5.8)²] =