Solve the problem using your calculator.The paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands). What is the correlation coefficient?
A. -0.071
B. 0.246
C. 0.708
D. 0.235
Answer: C
Mathematics
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Find the Jacobian 
or 
(as appropriate) using the given equations.
A. 35 B. 5 C. -5 D. -35
Mathematics
Change the polar coordinates (r, ?) to rectangular coordinates (x, y).
A. 
B. 
C. 
D. 
Mathematics
Find the product of the given complex number and its conjugate. Write the answer in the form a + bi.
+ 3i
A. 5 - 9i B. 14 C. 5 + 9i D. 2
Mathematics
Find the inverse of the function.f(x) = 
for x ? -7
A. f-1(x) = x2 - 49 B. f-1(x) = x2 - 7 C. f-1(x) = -x2 + 7 D. Not invertible
Mathematics