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Two models are (C(t)=80-4t) and (D(t)=70-2t). Which value is greater at (t=5)?

Answer and explanation

Correct answer: Both values are equal

Substituting \(t=5\), we get \(C(5)=80-4(5)=60\) and \(D(5)=70-2(5)=60\). Hence, both models give the same value. Options A and B are incorrect because neither value is larger than the other. Exam tip: Substitute the given value of \(t\) into each expression before comparing them.

Related tags

Linear FunctionsLinear DecaySubstitutionComparing ExpressionsPolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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