a. A sample contains 2472 atoms of phosphorus atoms. If each of phosphorus has 15 protons, what
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a. A sample contains 2472 atoms of phosphorus atoms. If each of phosphorus has 15 protons, what is the total number of protons in the sample?
b. A bicycle factory is assembling bicycle. In order to make 2220 bicycles this bicycles this month, how many cases of pedals will be need?
c. The distance from the earth to the moon 2.4×10 5 mi. Light (and radio waves) travel at 3.0x10 10 cm/sec. How long does it take for a radio signal to reach to moon?
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