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Verified answer
A. 7x10⁶ . 3x10⁻² . 2x10⁻⁴ = 42x10⁽⁶⁻²⁻⁴⁾=42x10¹=4,2x10²b. 5x10⁻⁹ / 2x10⁻³ = 10x10⁽⁻⁹⁻⁽⁻³⁾⁾ = 10x10⁻⁶ = 1x10⁻⁵