Plate glass sales G can be affected by the number of new building contracts B issued and the number of automobiles A produced, since plate glass is used in buildings and cars. To forecast sales, a plate glass company in California collected data for three consecutive years, shown in the table. All units are in millions. The data were modeled by G = aA + bB + e, where a, b, and e are constants.

(a) Write a system of linear equations whose solu- tion gives a, b, and c. 

(b) Solve this linear system. Write a formula for G. 

(c) For the following year, it was estimated that A = 7.75 and B = 47.4. Predict G. 

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G 603 5.54 657 6.93 779 7.64 B 37.1 41.3 45.6