Colors are made by mixing a secondary and primary color together.

I believe the term you are looking for is 'Tertiary Colors'. The six tertiary or intermediate colors are yellow-green, blue-green, blue-violet, red-violet, red-orange, and yellow-orange. I know it's a bit late, but I hope you still needed help on this question!

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art. 

Well if some words are like big you could say enormous .just make them sound more egxarreted