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Which of the following polynomials represents a quantity that decreases at a constant rate for every one-unit increase in x?

Answer and explanation

Correct answer: \(24-3x\)

\(24-3x\) is linear, and its coefficient of x is \(-3\); therefore, the value falls by 3 for each one-unit increase in x. Check: \(P(x+1)-P(x)=-3\). In \(24-3x^2\), the rate of decrease is not constant. Exam tip: look for degree 1 with a negative coefficient.

Related tags

PolynomialsLinear PolynomialLinear DecayConstant RateAlgebraClass 9 MathematicsLinear Growth And DecayIntroduction To Polynomials

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