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1) This relation is function because each month has one output. there can only be one output per input. However, each input can have the same output as another input but not multiple for each one.
2) The student d
Answer:
No for the first one because every input has a unique output but February has two outputs. For the second one the student did a horizontal test instead of a vertical test. Using the vertical test it is a function.
Explanation: