The double integral gives the mass of a lamina R. Determine the density ?, the mass, and the center of mass.
A. k; 21k?; 
B. Density is proportional to distance from the origin; 21k?; 
C. k; 21k?; 
D. Density is proportional to distance from the origin; 21k?; 
Answer: B
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A. f-1(x) = 
B. f-1(x) = 
C. f-1(x) = 
D. f-1(x) = 
Find the standard equation of a parabola with the given focus or directrix. Assume that the vertex is at the origin.Focus (-4, 0)
A. y2 = -4x B. x2 = -16y C. y = -16x2 D. y2 = -16x
Describe the rigid motion(s) that would be used to transform the above figure into the figure shown below.
A. Rotate 180° B. Reflect about vertical axis C. Reflect about diagonal axis D. Reflect about horizontal axis
Solve the problem.At the beginning of the month, Christopher had a balance of $177 in his checking account. During the next month, he wrote a check for $44, deposited $74, and wrote another check for $125. What was his balance at the end of the month?
A. -$82 B. $66 C. $82 D. -$66