What are the steps/rules of writing major scales?

Look at this painting by leonardo da vinci. this painting demonstrates da vinci's use of which of these to enhance the emotion of a painting

According to the article in wiki answer, digital communication systems have more benefits than analog systems. they are faster and more flexible, and they offer better performance than analog communication

Select the correct answer. which is an additive secondary color in the rgb model? a) yellow b) red c) blue d) green