Determine whether the relations represent functions. Identify the domain and range of each relation. 
A. function
domain:{18, 30, 42, 54}
range: {3, 5, 7, 9}
B. not a function
C. function
domain: {3, 5, 7, 9}
range: {18, 30, 42, 54}
Answer: C
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A. 
B. 
C. 
D. 