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If (Z(x)=b-9x) is linear decay and (Z(3)+Z(5)=114), what is (b)?

Answer and explanation

Correct answer: 93

Given \(Z(x)=b-9x\), we get \(Z(3)=b-27\) and \(Z(5)=b-45\). Hence, \(Z(3)+Z(5)=2b-72\). Using \(2b-72=114\), we obtain \(2b=186\), so \(b=93\). Therefore, 93 is the correct option. If \(b=90\), the sum would be 108, not 114. Exam tip: evaluate the function at each given input before substituting into the stated sum.

Related tags

Linear FunctionsLinear DecayPolynomialsAlgebraic SubstitutionParameter SolvingLinear Growth And DecayIntroduction To PolynomialsMathematics

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