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If (g(x)=b-7x) and (g(6)=74), what will (g(13)) be?

Answer and explanation

Correct answer: 25

Given \(g(x)=b-7x\), we have \(g(6)=b-7(6)=b-42\). Since \(g(6)=74\), \(b-42=74\), so \(b=116\). Now, \(g(13)=116-7(13)=116-91=25\). Therefore, 25 is the correct option. A value such as 32 can result from an error in subtraction. Exam tip: first find the unknown constant from the given function value, then substitute the required value of \(x\).

Related tags

Linear FunctionFunction EvaluationUnknown ConstantAlgebraic SubstitutionLinear DecayLinear Growth And DecayIntroduction To PolynomialsMathematics

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