Solve the problem.The function 
, 
, represents revenue in thousands of dollars where x represents the amount spent on advertising in tens of thousands of dollars. Find the inflection point for the function to determine the point of diminishing returns.
A. (14, 19,560)
B. (38.05, 6878.37)
C. (8, 16,224)
D. (9.6, 17,167.1)
Answer: C
Mathematics
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Find ? for 0° ? ? < 360°.sec ? = -1.631
A. 127.82°, 232.18° B. 127.82°, 307.82° C. -142.18°, 307.82° D. -58.49°, 418.49°
Mathematics
Give the value of the function in radians. Round to the nearest thousandth when necessary.sec-1 4.6125
A. 4.494 B. 1.352 C. 4.931 D. 1.354
Mathematics
Solve the problem.For x > 0, sketch a curve y = f(x) that has f(1) = 0 and f '(x) = - 
. Can anything be said about the concavity of such a curve? Give reasons for your answer.
What will be an ideal response?
Mathematics
Find the product of the given complex number and its conjugate.2
A. 4
B. 2
C. 2
D. 2
Mathematics