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If (f(t)=a+6t) and the sum of (f(1), f(5), f(9)) is (180), what is (a)?

Answer and explanation

Correct answer: 30

Given \(f(t)=a+6t\), we have \(f(1)=a+6\), \(f(5)=a+30\), and \(f(9)=a+54\). Their sum is \(3a+90\). Hence, \(3a+90=180\), so \(3a=90\) and \(a=30\). If 36 were used, the sum would be 198, so it is not correct. Exam tip: Evaluate the function at each specified input first, then form the equation using their sum.

Related tags

Linear FunctionPolynomial EvaluationParameter SolvingAlgebraic EquationsClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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