Which is a characteristic shared by nearly all nations of oceania?
a. controlled by australia
b. imperialist tendencies
c. a history of geographic and cultural isolation
d. strong economies

C. A history of geographic and cultural isolation

Explanation:

The region is made up of New Zealand, Australia and the island nations of the Pacific ocean is known as the Nations of Oceania. The countries which come in the Oceania region lean to separate by a huge ocean, so there was some cultural isolation happening to the countries in this region.

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