Find the moment or center of mass of the wire, as indicated.Find the center of mass of a wire that lies along the first-quadrant portion of the circle
if the density of the wire is 
A. 
= 0, 
= 
?
B. 
= 
?, 
= 
?
C. 
= 
?, 
= 
?
D. 
= 6?, 
= 6?
Answer: C
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Find a formula for the accumulation function A(x) that is equal to the indicated area.
A. A(x) = 
B. A(x) = 
C. A(x) = 
D. A(x) = a
Solve the problem.On a biology test, a student got 25 questions correct but did not pass. On a second attempt, the student got 30 questions correct. What was the percent of increase?
A. 80% B. 20% C. 16.7% D. 5%
Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = cos-1(x2 + y2)
A. Domain: all points in the x-y plane; range: all real numbers; level curves: circles with centers at (0, 0)
B. Domain: all points in the x-y plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0,0) and radii r, 0 < r ? 1
C. Domain: all points in the x-y plane; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
D. Domain: all points in the x-y plane satisfying x2 + y2 ? 1; range: real numbers - 
? z ? 
; level curves: circles with centers at (0, 0)
Simplify and reduce to lowest terms.
+ 
A. 
B. 
C. 2
D. 