Solve the problem.The paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands). By using linear regression, the following function is obtained: 
where x is the cost of advertising (in thousands of dollars) and y is number of products sold (in thousands). Use this function to predict the number of products sold if the cost of advertising is $13,000.
A. 92.07
B. 36,325.8
C. 98.77
D. 89.07
Answer: A
Mathematics
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, when x = 21 and y = 63
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A. 
B. 
C. 
D. 
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