Express the answers to the following calculations in

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=226dm
b. 25.4 mg to kilograms=.025400g
7. 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