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If (g(t)=b-4t) and the sum of (g(1), g(5), g(9)) is (156), what is (b)?

Answer and explanation

Correct answer: 72

Given \(g(t)=b-4t\), we get \(g(1)=b-4\), \(g(5)=b-20\), and \(g(9)=b-36\). Their sum is \((b-4)+(b-20)+(b-36)=3b-60\). Hence, \(3b-60=156\), so \(3b=216\) and \(b=72\). Therefore, option D is correct. If \(b=68\), the sum would be \(144\), not 156. Exam tip: Substitute each input value separately before adding the function values.

Related tags

Linear FunctionFunction EvaluationAlgebraic EquationsParameter ValuePolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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