Find the vertex of the parabola.f(x) = 4x - x2
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B. 
C. 
D. 
Answer: D
Mathematics
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Solve the problem.The shape and density of a thin shell are indicated below. Find the coordinates of the center of mass.Shell: cone x2 + y2 - z2 = 0 between z = 1 and z = 2Density: constant
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B. 
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D. 
Mathematics
Find the direction angle ? for the given vector. Let 0° ? ? < 360° and round ? to the nearest tenth when appropriate.
A. 53.1° B. 117.1° C. 216.9° D. 233.1°
Mathematics
Simplify the ratio.4 to 9
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B. 
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D. 
Mathematics
Simplify the series of additions and subtractions.-8 + 2 + 6
A. -16 B. -4 C. -12 D. 0
Mathematics