Based on data from 1970 to 2004, the U.S. production of crude oil p has been declining at a rate of 0.2689 quadrillion BTU per year t. In 2004, the U.S. production of crude oil was 11.53 quadrillion BTUs (Source: Statistical Abstract of the United States, 2007, Table 895). The model of the U.S. production of crude oil as a function of years since 1970 P (t) is given by the following linear function: P(t) = 0.2689 (t- 11.53) +34 P(t) = -0.2689 t - 11.53 P(t) = - 0.2689 (t - 34) +11.53 P(t) = -0.2689 t - 34