Carlos has 105 buttons. Ramona has twice as many buttons as Carlos, Daniel has 3 times as many buttons as Ramona. How many buttons do they have in all?

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Need asap write a short paper describing the history and differences between six sigma, waterfall, agile, and scrum models. understanding these models can give you a good idea of how diverse and interesting it development projects can be. describe what the rationale for them is and describe their key features. describe the history behind their development. at least 400 words

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