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I need help on this math assignment does anyone mind answering it?

I need help on this math assignment does anyone mind answering it?-example-1
User Shimizu
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2 Answers

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The answer is 4 Hope that helps!!
User Naomy
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The answer is 4. A function cannot have the same x value twice- 1 has two (2), 2 has all (1), 3 has two (-3), so 4 is the only answer.