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A taxi driver earns \(X\) dollars in fares during a shift but has to pay a fixed fee of \(\dollar 30\) for fuel and car rental. Let \(Y\) be the driver’s net profit.
  1. Express \(Y\) as a linear combination of \(X\).
  2. If the driver works 3 shifts with fares \(X_1,X_2,X_3\), express the total net profit \(T\) in terms of the \(X_i\) variables.

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