The following is a linear trend fitted to a series expressed in thousands of dollars. T196.74 +0.28t, where t is expressed in years. a. If we assume that the series is a flow variable, what is the value of the trend in September 1997 in thousands of dollars? Round your answer to the nearest second decimal. T₁ = b. Using the above trend equation, what is the trend value for the fourth quarter of 1987 in thousand of dollars? Round your answer to the nearest second decimal. T₁ = c. Using the above trend equation, what is the annual variation of the trend in dollars? T =

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