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If (D(t)=160-kt) and (D(4)-D(11)=63), what is (k)?

Answer and explanation

Correct answer: \(9\)

Given \(D(t)=160-kt\), we have \(D(4)=160-4k\) and \(D(11)=160-11k\). Therefore, \(D(4)-D(11)=(160-4k)-(160-11k)=7k\). Since this difference is \(63\), \(7k=63\), so \(k=9\). For example, \(k=8\) would give a difference of \(56\), not \(63\). Exam tip: Write the two function values separately before subtracting; the constant terms often cancel.

Related tags

Linear FunctionLinear DecayRate Of ChangePolynomialsAlgebraic SubstitutionLinear Growth And DecayIntroduction To PolynomialsMathematics

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