7.35 million tons in scientific notation

7.35*10^6

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10. In a parallelogram, the perimeter is equal to 48. (1) if the length of one side is known to be 12, the length of each side can be obtained; (2) if AB = 2BC, the length of each side can be obtained; (3) if the diagonal AC and BD intersect at point O, the difference between the perimeter of △ AOD and △ AOB is 10, the length of each side can be obtained
11. 120000 scientific notation
12. 2.89 million in scientific notation
13. 5 out of 6 hours = (?) seconds
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15. 3 hours 18 minutes 36 seconds = () hours
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