Determine all critical points for the function.f(x) = x3 - 9x2 + 4
A. x = 0 and x = 3
B. x = -3 and x = 3
C. x = 0 and x = 6
D. x = 0
Answer: C
Mathematics
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Find the volume under the surface z = f(x,y) and above the rectangle with the given boundaries.z = 4x2 + 9y2; R = {(x, y): 0 ? x ? 1, 0 ? y ? 1}
A. 
B. 
C. 
D. 
Mathematics
Write the domain of f in interval notation.f(x) = 
A. [2, ?) B. [-2, ?) C. (-2, ?) D. (2, ?)
Mathematics
Solve the equation by completing the square.x2 + 4x = 7
A. 2 + 
B. -2 ± 
C. -1 ± 
D. -2 ± 2
Mathematics
Multiply.-0.6(-0.8)
A. 0.48 B. -1.3 C. -0.2 D. -1.4
Mathematics