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Which of the following polynomials represents linear decay of a quantity with time \(t\), where the coefficient of \(t\) indicates the decrease per unit time?

Answer and explanation

Correct answer: \(P(t)=120-5t\)

In \(P(t)=120-5t\), the power of \(t\) is 1 and its coefficient is negative, so the value decreases by 5 per unit time. \(120-5t^2\) is not linear. Exam tip: a linear model always has degree 1.

Related tags

PolynomialsLinear DecayLinear GrowthDegree OneAlgebraic ModelsTime VariablesLinear Growth And DecayIntroduction To Polynomials

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