Swamps, wetlands, and sandy beaches are located throughout the region. A.
Great Plains
B.
Great Basin
C.
Coastal Plains
D.
Pacific Coast

Please select the best answer from the choices provided

A
B
C
D

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