Math question need help

 It is a function because every input has exactly one output. The domains are -5,5,3,-4  and the ranges are 4,-4,1,-8 .

Step-by-step explanation:

Domain is all the input values or the x values.

The range is all the output values or the y values

Domain      Range

 -5                  4

  5                 -4

  3                  1

  -4                 -8

16.9 times 2.85

step-by-step explanation:

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note: the best i know.