1 million is 1 x 10^6
1 billion is 1 x 10^9
1 trillion is 1 x 10^12
So 12 trillion miles is 12 x 10^12 which converts to 1.2 x 10^1 x 10^12 = 1.2 x 10^13
13.99 kilometers is the diameter.
Divide the circumference (43.96) by 2(pi), which should give you a radius of 6.99. You should then proceed to multiplying that by 2, since radius is half of the diameter, giving you 13.99.
Busy highway thats why they build sound barriers when a residetial area is directly next to a highway
Answer:
Most revolutions start because a certain group finds something unjust. For example, the French revolution basically started because the French people believed their government to be unjust. So, for a revolution to be a success would be for that particular group to change what they saw as wrong.
Hope this helps :)