According to the map of sub-saharan africa, the clearing of land to support populations has lead to
a) increased air pollution.
b) decreased air pollution.
c) increased mortality rates.
d) decreased mortality rates.

a) increased air pollution

Explanation: I just took the USA TEST PREP and chose D) decreased mortality rates and got it wrong.

the answer would be the third option, "no, ariel should have added 9^2 and 12^2 and compared that to 15^2."

this is found through the pythagorean theorem, which is a^2 + b^2 = c^2.

this is the correct way of solving the problem:

9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225