Answer:
B, D, and E
Explanation:
First, the formula for the area of a circle is 

Since pi is equal to 3.14, all we need is the radius squared. Since your radius is 12,
=144. Therefore, your equation for <em>area</em> will be (3.14)(144), answer B.
Second, the formula for the circumference of a circle is
.
So, 2(3.14)(12), answer D.
Edit: Answer E also says the same as above- it just multiples the 2 and the 12 together. Sorry for the initial error!
Answer: A "The Decrease in trade among societies
Explanation:
As cities grow, s does their impact on other societies. In order to grow more, cities need to trade materials they have abundance in for materials they don't
The answers I believe is c
There are 7 continents:
Asia
Africa
North America
South America
Antarctica
Europe
Australia
from largest to smallest