Determine whether the given sequence is arithmetic, geometric, or neither. If the sequence is arithmetic, find the common difference; if it is geometric, find the common ratio.3, 5, 7, 11, 13, ...
A. Arithmetic; d = 4
B. Geometric; r = 2
C. Arithmetic; d = 2
D. Neither
Answer: D
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Find the volume of the indicated region.the region bounded by the paraboloid 
and the xy-plane
A. 20?
B. 80?
C. 
?
D. 200?
Determine whether the argument is valid or invalid.All women are wealthy. Amanda is a woman. Therefore, Amanda is wealthy.
A. Valid B. Invalid
Determine whether the graph is a tree.A computer virus infects a large number of computers at a sensitive government department. The department officials identify a single floppy disk as the source of the infection. The floppy disk was circulated among all of the staff members, who each infected their own computer when they loaded the disk into their computer. To track the circulation of the infecting disk, a graph is drawn where vertices represent staff members with infected computers and edges connect each person to the staff member from whom the person first received the disk. Must the graph necessarily be a tree?
A. Yes B. No
Provide an appropriate response.A welder can make 12 welds in an hour. How many welds can 15 welders working at this rate make in an 8 hour day?
A. 180 B. 1,440 C. 1,280 D. 640 E. none of the above