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3.Express the answers to the following calculations in scientific notation: (12 points)4.What is the number of significant figures in each of the following measurements? (8 points)1
5.Express the results in the proper number of significant figures. (12 points)6.Carry out the following conversions: (16 points)a.22.6 m to dm=226dmb.25.4 mg to kilograms=.025400g7.The average speed of helium at 25°C is 1255 m/s. Convert this speed to miles per hour (mph). (4 points)2
8.How many minutes does it take light from the sun to reach Earth? (The distance