4. which of the following twentieth-century artists believed in a philosophy of art that stressed expressiveness, used colors to communicate emotion, and maintained that art should hint rather than be dogmatic?

Well, it seems like a multiple choice question; but you didn't provide any answers so I took the liberty of searching it up for you. The answer is O'Keeffe.

It depends on what type of third separates the three notes.for example: if you have two mayor thirds is an "aumented chord"if you have two minor thirds is an "diminued chord"if you have one mayor first and then one minor is a "mayor chord"and inverted is a "minor chord"

Ineed the list of artworks and characteristics.