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What type of change in a quantity is represented by the linear model \(N(t)=a-bt\), where \(b>0\)?

Answer and explanation

Correct answer: A uniform decrease with time

This represents linear decay because increasing \(t\) by 1 changes \(N\) by the fixed amount \(-b\). Thus, the quantity decreases by \(b\) per time unit. Option D has a changing rate, so it is not linear. Exam tip: a negative coefficient of \(t\) indicates decay.

Related tags

Linear GrowthLinear DecayPolynomialsLinear ModelCoefficientClass 9 MathematicsLinear Growth And DecayIntroduction To Polynomials

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