Provide an appropriate response.Consider determining how many possible phone numbers there are in an area code (repeated digits allowed). Is this an exercise in combinations, permutations, or neither?
A. Combinations
B. Permutations
C. Neither
Answer: C
Mathematics
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Find the center of mass of a thin plate of constant density covering the given region.The region between the x-axis and the curve y = 3csc2 x, 
? x ? 
A. 
= 
, 
= 3
B. 
= 
, 
= 2
C. 
= 
, 
= 4
D. 
= 
, 
= 
Mathematics
Write the statement as an inequality.z is less than or equal to -6
A. z < -6 B. z > -6 C. z = -6 D. z ? -6
Mathematics
Sketch the graph and find the area of the region completely enclosed by the graphs of the given functions f and g.
?
and 
?
A. ?
sq units.
?
B. ?
sq units.
?
C. ?
sq units.
?
D. ?
sq units.
?
Mathematics
Provide an appropriate response.If the rational expression 
represents the area of a rectangle and 
represents the length of the rectangle, what rational expression represents the width?
A. 
B. 
C. 
D. 
Mathematics