Answer:
I think the answer is only 2, hope this helps
Explanation:
52,000,000 km = ✔ 2 significant figures
3,000. g = ✔ 4 significant figures
0.0000750 m = ✔ 3 significant figures
1.7 × 10-6 cm = ✔ 2 significant figures
3 × 108 g = ✔ 1 significant figures
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