Evaluate the expression.-33
A. -9
B. 27
C. -27
D. 9
Answer: C
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Use a spherical coordinate integral to find the volume of the given solid.the solid bounded below by the xy-plane, on the sides by the sphere 
and above by the cone 
A. 16?
B. 
?
C. 32?
D. 
?
Find the center of mass of the thin rod with the given density function.Find the center of mass of a thin rod that lies along the first-quadrant portion of the circle
if the density of the rod is 
A. 
= 
?, 
= 
?
B. 
= 0, 
= 
?
C. 
= 2?, 
= 2?
D. 
= 
?, 
= 
?
The healing law for skin wounds states that
?
?
where A is the number of square centimeters of unhealed skin after t days when the original area of the wound was A0 . Graph the healing curve for a wound of 50 cm 2 .
?
A. 
B. ?
C. ?
D. ?
Find an equation for the ellipse described.Center at (0, 0); focus at (-3, 0); vertex at (6, 0)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1