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 ) = 1.4598 x 10² 2. 79,500 ÷ (2.5 × 10 2 ) = 3.18 x 10² 3. (7.0 × 10 –3 ) – (8.0 × 10 –4 ) = 6.2 x 10 ³ 4. (1.0 × 10 4 ) × (9.9 × 10 6 ) = 9.9 x 10¹ (Reference: Chang 1.31) 4.What is the number of significant figures in each of the following measurements? (8 points)a.4867 mi b.56 mL 4 2
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5 3 1 2 5.Express the results in the proper number of significant figures. (12 points) 6.Carry out the following conversions: (16 points) 3.556 mL to liters= 4.10.6 kg/m 7.The average speed of helium at 25°C is 1255 m/s. Convert this speed to miles per hour (mph). (4 points)
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