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Which of the following situations is best represented by a linear polynomial such as \(p(x)=ax+b\), where \(a<0\)?

Answer and explanation

Correct answer: The water in a tank decreases by the same amount every minute.

A decrease by the same amount in equal time intervals is linear decay, so the slope \(a\) is negative. For equal intervals, \(\Delta p=a\Delta x\) remains constant. A fixed percentage decrease is exponential. Exam tip: “same amount” signals a linear model.

Related tags

Linear PolynomialsLinear DecayNegative SlopePolynomial ApplicationsClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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