Respuesta :

Step 1

Pick any two points

(1,25) and (2,22)

Step 2

Find rate of change.

[tex]\begin{gathered} \text{Rate of change = }\frac{22\text{ - 25}}{2\text{ - 1}} \\ \text{ = }\frac{-3}{1} \\ \text{ = -3 coins per wash} \end{gathered}[/tex]

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