Answer the question.Choose the expression that is equivalent to the following: 12x + 3y
A. 3(9x + y)
B. 15xy
C. 3(4x + y)
D. 3(4x + 3y)
Answer: C
Mathematics
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Find the series' radius of convergence.
A. 0 B. 2 C. 1 D. ?, for all x
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Fill in the blank with one of the words or phrases listed below. 
A 
is a rate with a denominator of 1.
A. proportion B. ratio C. unit price D. unit rate
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Simplify.
A. 
B. 
C. 
D. 
Mathematics
Divide and, if possible, simplify. Assume all variables represent positive real numbers.
A. 
B. 
C. 
D. 
Mathematics