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A quantity has an initial value of 500 and decreases at a constant rate of 12 per unit time. Which polynomial represents this linear decay?

Answer and explanation

Correct answer: \(B(x)=500-12x\)

At \(x=0\), the constant term gives the initial value, so it must be 500. The coefficient \(-12\) shows a constant decrease. A term containing \(x^2\) is not linear. Exam tip: linear decay always has a negative slope.

Related tags

PolynomialsLinear DecayLinear GrowthAlgebraic ExpressionsGrade 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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