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Vocabulary Is every relation also a function? Use the drop-down menus to show and explain your answer.



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; A
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is a special type of
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where each input maps to exactly one output. In a
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, an input can have one or more outputs.

Respuesta :

Answer:

19

Step-by-step explanation:

9+10 is not 21 it is 19.

If 2 tens make a 20 and 1 number is gone, 20-1=19

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