Find the correlation coefficient.The following are costs of advertising (in thousands of dollars) and the number of products sold (in thousands): 
A. -0.0707
B. 0.2456
C. 0.2353
D. 0.7077
Answer: D
Mathematics
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A. Left-skewed B. Symmetric C. Right-skewed
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Determine whether or not the graph is a graph of a function of x.
A. Function B. Not a function
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Write the fraction and mixed number as a percent.
A. 1000% B. 39% C. 7.8% D. 78%
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Verify that the values of the variables listed are solutions of the system of equations.
x = -1, y = 3
A. solution B. not a solution
Mathematics