Solve the problem.Find the center of mass of the hemisphere of constant density bounded 
and the 
A. 
= 0, 
= 0, 
= 
B. 
= 0, 
= 0, 
= 
C. 
= 0, 
= 0, 
= 1
D. 
= 0, 
= 0, 
= 
Answer: D
Mathematics
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A. D: (-?,0], R: (-?,-3] B. D: [0,?), R: (-?, ?) C. D: [0,?), R: [-3,?) D. D: (-?, ?), R: [-3,?)
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Use a double-angle identity to find the exact value of the expression.1 - 2 sin2 
A. 
B. - 
C. - 
D. 
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Find the area of the triangle. If necessary, round the answer to two decimal places. 
A. 37.23 B. 7.64 C. 153.5 D. 2.62
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Graph the compound inequality.x + y ? 2 and y ? 2
A. 
B. 
C. 
D. 
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