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Which observation is the clearest indication of linear decay of a quantity \(P\) over time?

Answer and explanation

Correct answer: \(P\) decreases by 7 units in every equal time interval

In linear decay, the change over equal time intervals is constant. Here the change is always \(-7\), so the slope is fixed and the model has the form \(P=a-7t\). A 10% decrease depends on the current value, so it is not linear. Exam tip: check for equal first differences.

Related tags

Linear DecayLinear GrowthPolynomialsFirst DifferencesRate Of ChangeClass 9 MathematicsLinear Growth And DecayIntroduction To Polynomials

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