Do you think the water in Crater Lake is fresh or salty? Why?

Crater Lake (in southern Oregon, in the United States) is “freshwater” in the extreme. It’s one of the purest natural bodies of water on our planet. It’s pure enough to safely drink it directly, without having to filter it first.

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