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If (D(t)=300-kt) and (D(4)-D(12)=104), what is (k)?

Answer and explanation

Correct answer: 13

Given \(D(t)=300-kt\), we have \(D(4)=300-4k\) and \(D(12)=300-12k\). Therefore, \(D(4)-D(12)=(300-4k)-(300-12k)=8k\). Since \(8k=104\), \(k=13\), so option C is correct. If \(k=12\), the difference would be \(96\), not the given \(104\). Exam tip: When subtracting two expressions, carefully distribute the negative sign across the second expression.

Related tags

Linear FunctionLinear DecayRate Of ChangePolynomialsAlgebraic SubstitutionLinear Growth And DecayIntroduction To PolynomialsMathematics

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