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If (f(t)=a+4t) and the sum of (f(1), f(3), f(5)) is (81), what is (a)?

Answer and explanation

Correct answer: 15

Given f(t)=a+4t, we get f(1)=a+4, f(3)=a+12, and f(5)=a+20. Their sum is 3a+36. Hence, 3a+36=81, so 3a=45 and a=15. If a were 17, the sum would be 87, so it is not correct. Exam tip: substitute each given value of t into the function before adding the results.

Related tags

Linear FunctionPolynomial EvaluationParameter ValueAlgebraic EquationsFunction ValuesLinear Growth And DecayIntroduction To PolynomialsMathematics

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