Dalawang pangunahing estruktura ng pamilihan​

image result for two major market structure

There are four basic types of market structures: perfect competition, imperfect competition, oligopoly, and monopoly. ... Meanwhile, monopolistic competition refers to a market structure, where a large number of small firms compete against each other with differentiated products.Explanation:

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