Ra te me (free points :3)

How did brunelleschi solve his problem with the dome of the florence cathedral? a. he created an outer support shell. b. he created many layers of support within the dome. c. he created external supports for the dome. d. all of the above

Arestaurant with food revenue of $500,000 and a cost of food of $100,000 has a food cost ratio of 0.2. true false

I’m a paragraph of no less than 125 words, explain the single most important factor involved in advancing american classical music in the twentieth century.