Using the rules of significant figures, calculate the following:7721 2.77 3 2.772 Convert 1903.8 g to mg.9038103mg 19.038 mg 190.38 mg 1.9038106mg 1….

Using the rules of significant figures, calculate the following: 
2.7721
2.8
2.77
3
2.772
Convert 1903.8 g to mg.
1.9038×103 mg
19.038 mg
190.38 mg
1.9038×106 mg
1.9038 mg
What is the mass of lead in a bar that measures 3.0 cm by 5.0 cm by 20.0 cm? (The density of lead is 11.3 g/cm3 at 20°C.)
3400. g
26.5 g
3390 g
3.4×103 g
300 g
The pressure of the earth’s atmosphere at sea level is 14.7 lb/in2. What is the pressure when expressed in kg/m2? (2.54 cm = 1 in., 2.205 lb = 1 kg)
5.02×104 kg/m2
2.09×10-2 g/m2
4.30×10-3 kg/m2
1.03×104 kg/m2
2.62×102 kg/m2