Solve the problem.The cost in millions of dollars for a company to manufacture x thousand automobiles is given by 
Find the output at the vertex of the parabola (the number of automobiles that must be produced to minimize the cost).
A. 6 thousand automobiles
B. 9 thousand automobiles
C. 54 thousand automobiles
D. 3 thousand automobiles
Answer: D
Mathematics
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Find all the second order partial derivatives of the given function.f(x, y) = ln (x2y - x)
A. 
= 
; 
= 
; 
= 
= 
B. 
= 
; 
= - 
; 
= 
= - 
C. 
= 
; 
= - 
; 
= 
= - 
D. 
= 
; 
= - 
; 
= 
= - 
Mathematics
Find the total area of the region between the curve and the x-axis.y = -x2 + 9; 0 ? x ? 5
A. 
B. 
C. 
D. 
Mathematics
Write rational exponents in radical notation and radicals in rational exponential notation.
A. x3/2 B. x6 C. x2/3 D. x3
Mathematics
Find the sum.Find the sum of the first 20 terms of the arithmetic sequence: -8, -18, -28, -38, . . .
A. -2055 B. -2060 C. -208 D. -2160
Mathematics