Find the domain of the rational function.f(x) = 
A. all real numbers
B. {x|x ? 1}
C. {x|x ? -1}
D. {x|x ? 0}
Answer: C
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Find the center of mass of a thin plate covering the given region with the given density function.The region between the x-axis and the curve y = 
, 1 ? x ? 2, with density ?(x) = 
A. 
= 
, 
= 3
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Solve the problem.Punky went to dinner. Her bill was $18.42, and she left a 20% tip. How much was the tip, rounded to the nearest dollar?
A. $22 B. $4 C. $7 D. $37
Perform the indicated operation. Simplify if possible.
+ 
A. 
B. 
C. 
D. 
For the given representation of f, graph its reflection across the 
and the 
f(x) = x2 - 3x - 1
A. x-axis: y = x2 + 3x - 1
y-axis: y = -x2 + 3x + 1
B. x-axis: y = -x2 - 3x - 1
y-axis: y = -x2 - 3x - 1
C. x-axis: y = x2 + 3x - 1
y-axis: y = -x2 + 3x - 1
D. x-axis: y = -x2 + 3x + 1
y-axis: y = x2 + 3x - 1