Express the answers to the following calculations in scientific notation 12

# Express the answers to the following calculations in

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3.Express the answers to the following calculations in scientific notation: (12 points) 1. 145.75 + (2.3 × 10 –1 ) 1.4598x10 2 2. 79,500 ÷ (2.5 × 10 2 ) 3.18x10 2 3. (7.0 × 10 –3 ) – (8.0 × 10 –4 ) 6.2x10 -3 4. (1.0 × 10 4 ) × (9.9 × 10 6 ) 9.9x10 10 (Reference: Chang 1.31) 4.What is the number of significant figures in each of the following measurements? (8 points) a. 4867 mi 4 b. 56 mL 2 c. 60,104 ton 5 d. 2900 g 2-4 e. 40.2 g/cm 3 3 f. 0.0000003 cm 1 g. 0.7 min 1 h. 4.6 × 10 19 atoms 2 (Reference: Chang 1.33 5.Express the results in the proper number of significant figures. (12 points) 1. 5.6792 m + 0.6 m + 4.33 m 10.6092m (5) 2. 3.70 g – 2.9133 g 0.7867g (4) 3. 4.51 cm × 3.6666 cm 16.536366 cm (8) 4. (3 × 10 4 g + 6.827g)/(0.043 cm 3 – 0.021 cm 3 ) 30006.827g/.022 cm 3 (Reference: Chang 1.35) 6.Carry out the following conversions: (16 points) 2.25.4 mg to kilograms .0254 kg 3.556 mL to liters .556 l 3 7.The average speed of helium at 25°C is 1255 m/s. Convert this speed to miles per hour (mph). (4 points) 8.How many minutes does it take light from the sun to reach Earth? (The distance from the  • • • 