What kind of weather would cumulonimbus clouds likely bring?
a. clear and sunny
c. light rain
b. hurricane
d. thunderstorm

search the internet. you may find the correct answer!

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