state the number of significant figures 0.050cm,0.0009m,0.039m,6.37×10⁶m,0.009203m²,1.99×10³⁰kg,9.1×10-³⁰kg,3.08×10⁶s,2.99×10⁸m/s,1.60×10-¹⁹j
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