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A quantity has an initial value of 240 and decreases uniformly by 12 units per unit time. Which of the following represents this linear decay model?

Answer and explanation

Correct answer: \(P(t)=240-12t\)

For \(P(0)=240\), the constant term must be 240. Uniform decay requires a negative slope, so \(-12t\) is correct. \(240-12t^2\) is not linear. Exam tip: in a linear model, the variable has power 1.

Related tags

Linear DecayLinear ModelSlopePolynomialsGrade 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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