If a person was on board a hypersonic airplane what do you think they would be able to see as they look out a window looking in the direction the plane is flying? looking straight down at the ground?

Idon understand these and need some ! ?

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

Which argument is not a valid filter? does not equal this quarter filter by cell color all of these are valid filter arguments.