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If (Z(x)=b-12x) is linear decay and (Z(3)+Z(8)=148), what is (b)?

Answer and explanation

Correct answer: 140

Given \(Z(x)=b-12x\), we have \(Z(3)=b-36\) and \(Z(8)=b-96\). Thus, \(Z(3)+Z(8)=2b-132=148\). Hence \(2b=280\), so \(b=140\). If 144 were used, the sum would be \(156\), not 148. Exam tip: Substitute each given \(x\)-value into the function separately before adding the results.

Related tags

Linear PolynomialLinear DecaySubstitutionAlgebraic EquationsParameter ValueLinear Growth And DecayIntroduction To PolynomialsMathematics

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