Complete the identity.
= ?
A. 
B. cos2 
C. 
D. sin2 
Answer: C
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Solve the problem.Find the center of mass of the region of constant density bounded from above by the sphere 
and from below by the cone 
A. 
= 0, 
= 0, 
= 
(2 + 
)
B. 
= 0, 
= 0, 
= 
(2 + 
)
C. 
= 0, 
= 0, 
= 
(2 + 
)
D. 
= 0, 
= 0, 
= 
(2 + 
)
Simplify the complex number to its rectangular form.7j + 5j2
A. 12j B. 2 C. -5 + 7j D. 5 + 7j
Given the set sketched on the number line, identify the type of interval (open, closed, half-open, open infinite, closed infinite), write the set using set-builder notation, and write the set using interval notation.
A. open infinite interval; {x|x > 5}; (5, ?) B. open infinite interval; {x|x < 5}; (-?, 5) C. closed infinite interval; {x|x ? 5}; (-?, 5] D. closed infinite interval; {x|x ? 5}; [5, ?)
Solve the equation. Express radicals in simplest form.0.1x2 - 0.2x = 0.1
A. {2 + 
, 2 - 
}
B. {2 - 
}
C. {1 + 
, 1 - 
}
D. {1 + 
}