5.4 × 104 written in regular notation is 54,000
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4.2 × 10-4 written in regular notation is 0.00042
7.2 × 10-4 written in regular notation is 0.00072
4.2 × 10-4 written in regular notation is 0.00042
4.0 × 105 written in regular notation is: 400,000
1.72 × 104 written in regular notation is 17,200