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Which of the following models represents linear decay, where the quantity decreases by the same amount in each equal time interval?

Answer and explanation

Correct answer: \(Q=80-5t\)

In \(Q=80-5t\), the coefficient of \(t\) is the constant \(-5\), so the quantity falls by 5 units per time interval. \(80+5t\) shows growth, not decay. Exam tip: linear decay has a constant negative slope.

Related tags

Linear DecayLinear ModelPolynomialsRate Of ChangeGrade 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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