What are the advantages of using signal flow graph over the block diagram reduction?

Hurrry plzzz 16 pointsssss which major economic activity in the middle east occurs largely in the areas circled on the map above? a. coal mining b. farming c. nomadic herding d. oil production

What happens after a star goes supernova? just wondering! [tex]supernova [/tex] answer asap i really wanna know!

One day you learn that this same wealthy friend has become active in a community organization that serves the mentally challenged and their parents. you are told that her work with mentally challenged children consumes most of her weekends and a substantial part of her income and that she lives in modest circumstances. you find this hard to believe, and you suspect that somehow she is profiting from her involvement.