The following table shows data for the cost of natural gas in Maryland (in dollars per Million Btu) for x years since 1990.   Year   x Price in $ per Million Btu 1990   6.31 1991   6.14 1992   6.32 1993   6.75 1994   6.8 1995   6.34 1996   7.46 1997   8.12 1998   8.04 1999   8.25 2000   9.58 2001   11.28 2002   9.25   a. Define the explanatory and response variables for this problem.       b. Use the calculator to obtain the linear regression line of best fit for the original prices; round to three decimal places. Write this prediction equation in the form:     a. In a brief sentence, interpret the slope in the context of the problem.

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Exponential Growth Model

The relation that represents an exponential function is: