What is formality in a sociolinguistic context?

Before tuberculosis was understood to be a communicable disease, and before the discovery of antibiotics to treat it, a major outbreak could kill or cripple a significant portion of a nation’s labor force. how would such an event affect the economy? illustrate the effect by dragging to shift either the aggregate demand curve or the long-run aggregate supply curve.

Why do you think that wilson 14 point was not put into practice

What does one prolonged blast and one short blast mean?