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If (g(x)=b-9x) and (g(5)=72), what will (g(11)) be?

Answer and explanation

Correct answer: 18

Given \(g(x)=b-9x\). Substituting \(x=5\), \(g(5)=b-45=72\), so \(b=117\). Now, substituting \(x=11\), \(g(11)=117-9(11)=117-99=18\). Hence, 18 is the correct option. The nearby distractor 27 would result from incorrectly using \(117-90\) instead of calculating \(9\times11\). Exam tip: first find the unknown constant using the given function value, then substitute the required input.

Related tags

Linear FunctionPolynomial EvaluationSubstitutionConstant TermAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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