3. Express each of the following in the form kx 10; (1 ≤ k < 10) (i) (1.25 x 107) + (5 × 10³) (iii) (1.6 × 10⁹) × (5.0 × 10-³) (ii) (2.5 × 10¹0) × (31.25 x 10-5) (iv) [(3.4 x 104) x (5.0 × 10³)] + [2.0 × 105]
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0.00729
=7.29×10
−3
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