express the following in decimal notation:

6 × 10⁸
2.46 × 10-⁹
86.4 × 10¹³
88.31 × 10-¹¹
32.4 × 10-¹⁰

write the numbers of significant figures for

54652831 ______________
400000000024 __________
0.0000000946 ___________
0.00006200 _____________
954.000616000 ___________

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