Decide whether or not the set is closed under multiplication.{1, 2, 3, 4, . . .}
A. Closed
B. Not closed
Answer: A
Mathematics
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Find the sum of the series by recognizing how it is related to something familiar.
A. 
B. x3e-4x
C. 
D. x3e4x
Mathematics
Use this graph to answer the question.Big "D" Sales for 2009 and 2010 
MonthWhat month in 2009 had the highest sales?
A. Month 12 B. Month 2 C. Month 3 D. Month 5
Mathematics
Factor completely.x2 + 2xy - 24y2
A. (x - 6y)(x + y) B. (x + 6y)(x - 4y) C. (x - 6y)(x + 4y) D. (x - y)(x + 4y)
Mathematics
Provide an appropriate response.
Find the angle between the two tent poles as illustrated if the length of one pole is 6 ft and the length of the other pole is 8 ft.
A. 48.6° B. 36.9° C. 41.1° D. 53.1°
Mathematics