The graph shows the monthly revenue in millions of dollars of a growing company after the company doubled its advertising. Use the graph to solve the problem. 
From 9 months after the advertising was doubled to 12 months after the advertising was doubled, the revenue is graphed as a horizontal line. Write the equation of the line.
A. x = 6
B. y = 3
C. x = 3
D. y = 6
Answer: D
Mathematics
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A. 0.025; 
B. 0.0025; 
C. 0.25; 
D. 0.000025; 
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Find the slope of the line that passes through the given two points. If the slope is undefined, state this.(1, 4) and (13, 19)
A. 
B. 
C. 
D. 
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Graph the function.y = -3 tan 
A. 
B. 
C. 
D. 
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Find the exact value of the expression or state that it does not exist.cos-1 
A. 
B. 
C. 0
D. ?
Mathematics