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If (C(t)=31+kt) and (C(9)-C(4)=60), what is (k)?

Answer and explanation

Correct answer: 12

Given \(C(t)=31+kt\), we have \(C(9)=31+9k\) and \(C(4)=31+4k\). Hence, \(C(9)-C(4)=(31+9k)-(31+4k)=5k\). Since this difference is 60, \(5k=60\), so \(k=12\). Option 15 would result from incorrectly taking the time difference as 4; the correct difference is \(9-4=5\). Exam tip: when subtracting two values of a linear expression, the constant term cancels out.

Related tags

Linear GrowthLinear EquationPolynomialsRate Of ChangeAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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