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If (K(t)=120-5t), what is (K(t)-K(3t))?

Answer and explanation

Correct answer: \(10t\)

First, substitute \(3t\) for \(t\): \(K(3t)=120-5(3t)=120-15t\). Therefore, \(K(t)-K(3t)=(120-5t)-(120-15t)=120-5t-120+15t=10t\). Hence, the correct answer is \(10t\). The expression \(15t\) is only the value of \(5(3t)\), not the complete difference. Exam tip: use brackets while subtracting expressions so that the signs are handled correctly.

Related tags

PolynomialsLinear FunctionsSubstitutionAlgebraic SimplificationFunction EvaluationLinear Growth And DecayIntroduction To PolynomialsMathematics

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