Hey there!
In order to find the answer you have to MULTIPLY the kilometers (km) [21.5] from 100,000 and then you should be able to find your answer in centimeters (cm)
21.5 km * 100,000 = ? cm
Simplify that equation:
cm = 2,150,000
Therefore, your answer should be: 2,150,000
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)