Why did the engineers on the project to break the sound barrier have to analyze data from instruments attached to the X-1 aircraft?

1st and 3rd : ) now lemme smash

keeping a cash reserve because cash flow is the the movement of money through a company and if it just sits there, it wont the movement

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

i think the answer is the one about environmental and social health.

hope this