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If (g(t)=b-3t) and the sum of (g(2), g(4), g(6)) is (144), what is (b)?

Answer and explanation

Correct answer: 60

Given \(g(t)=b-3t\), we get \(g(2)=b-6\), \(g(4)=b-12\), and \(g(6)=b-18\). Their sum is \((b-6)+(b-12)+(b-18)=3b-36\). Hence \(3b-36=144\), so \(3b=180\) and \(b=60\). If 54 is used instead, the sum becomes \(126\), not 144. Exam tip: In such questions, first evaluate the function at every given input and then form the sum equation.

Related tags

Linear FunctionPolynomial EvaluationAlgebraic EquationsParameter ValueClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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