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Calculating forecast based on trend equation

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Excel was used to obtain the following quadratic trend equation:

Sales = 100 - 10X + 15X2

The data used was form 1989 through 1998, coded 0 to 9. The forecast for 199 is_________

A. 1,225
B. 980
C. 1,500
D. 1,600

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Excel was used to obtain the following quadratic trend ...

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