O que o grafico da primeira pagina desta aula revela sobre a demanda de petroleo ao longo do tempo?

The clear rendering however reads;

What does the graph on the first page of this class reveal about the demand for oil over time?

Explanation:

Since the graph is not provided, note the following about demand curve (graph). A demand graph is diagrammatic representation of how demand changes over time.

Thus, demand is usually plotted against price. I'll recommend you look carefully at the trend of the graph to find rising peaks and falling peaks which would indicate if demand is stable or not.