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If (Z(x)=b-15x) is linear decay and (Z(4)+Z(8)=160), what is (b)?

Answer and explanation

Correct answer: 170

Given \(Z(x)=b-15x\), we get \(Z(4)=b-60\) and \(Z(8)=b-120\). Hence, \(Z(4)+Z(8)=2b-180\). Using \(2b-180=160\), we obtain \(2b=340\), so \(b=170\). For example, choosing 180 would make the sum 180, not 160. Exam tip: substitute each given value of \(x\) into the function separately before adding the results.

Related tags

Linear PolynomialLinear DecaySubstitutionAlgebraic EquationsParameter ValueLinear Growth And DecayIntroduction To PolynomialsMathematics

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