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In the context of functions, if a quantity is represented by \(R(t)=90-5t\), what situation does this expression describe?

Answer and explanation

Correct answer: The quantity decreases by 5 units per unit of time.

The coefficient of \(t\) is \(-5\), so when time increases by 1 unit, \(R\) falls by 5 units. Here 90 is the initial amount, not the rate of growth. Exam tip: a negative coefficient indicates decay.

Related tags

PolynomialsLinear FunctionsLinear DecayRate Of ChangeClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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