Given the set sketched on the number line, identify the type of interval (open, closed, half-open, open infinite, closed infinite), write the set using set-builder notation, and write the set using interval notation.
A. closed infinite interval; {x|x ? 1}; [1, ?)
B. open infinite interval; {x|x > 1}; (1, ?)
C. open infinite interval; {x|x < 1}; (-?, 1)
D. closed infinite interval; {x|x ? 1}; (-?, 1]
Answer: C
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3 ft
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B. 2
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C. 2
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A. 
B. 
C. 1
D. 