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)a.145.75 + (2.3 × 10–1)145.75+.23= 145.98= 1.4598*102b.79,500 ÷ (2.5 × 102)79,500/250=318= 3.18*102c.(7.0 × 10–3) – (8.0 × 10–4).007-.008=.0062= 6.2*10–3d.(1.0 × 104) × (9.9 × 106)10,000*9,900,000= 99,000,000,000= 9.9*10101Copyright © 2017 by Thomas Edison State University. All rights reserved.
(Reference: Chang 1.31)4.What is the number of significant figures in each of the following measurements? (8 points)
4
2
5d.2900 g - 4
3
1g.0.7 min - 1
2
5.Express the results in the proper number of significant figures. (12 points)
b.3.70 g – 2.9133 g - .79gc.4.51 cm × 3.6666 cm
3
6.Carry out the following conversions: (16 points)a.22.6 m to dm
b.25.4 mg to kilograms
kg
3
7.The average speed of helium at 25°C is 1255 m/s. Convert this speed to miles per hour (mph). (4 points)
(Reference: Chang 1.41)2Copyright © 2017 by Thomas Edison State University. All rights reserved.

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