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If (D(t)=240-kt) and (D(5)-D(13)=96), what is (k)?

Answer and explanation

Correct answer: \(12\)

Given \(D(t)=240-kt\), we have \(D(5)=240-5k\) and \(D(13)=240-13k\). Hence, \(D(5)-D(13)=(240-5k)-(240-13k)=8k\). Therefore, \(8k=96\), so \(k=12\). If \(k=16\), the difference would be \(128\), not \(96\). Exam tip: when subtracting two values of a linear expression, the constant terms cancel.

Related tags

Linear FunctionRate Of ChangeAlgebraic SubstitutionPolynomialsLinear DecayLinear Growth And DecayIntroduction To PolynomialsMathematics

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