Question

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Answer 1

Substitute x=30 to find the profit of washing 30 cars:

`\begin{gathered} f(x)=8(x-2)-20 \\ \Rightarrow f(30)=8(30-2)-20 \\ =8(28)-20 \\ =224-20 \\ =204 \end{gathered}`

Therefore, the profit for washing 30 cars is:

`204\text{ dollars}`