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If (C(t)=18+kt) and (C(5)-C(2)=21), what is (k)?

Answer and explanation

Correct answer: 7

Given \(C(t)=18+kt\), we have \(C(5)=18+5k\) and \(C(2)=18+2k\). Therefore, \(C(5)-C(2)=(18+5k)-(18+2k)=3k\). Since this difference is 21, \(3k=21\), so \(k=7\). Option 21 is the given difference, not the value of \(k\). Exam tip: when subtracting two values of a linear expression, the constant term cancels out.

Related tags

Linear FunctionRate Of ChangePolynomialsAlgebraic SubstitutionLinear GrowthLinear Growth And DecayIntroduction To PolynomialsMathematics

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