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If (C(t)=330-9t) and (D(t)=230-18t), how does (C(t)-D(t)) change?

Answer and explanation

Correct answer: It increases by 9 each step

Find the difference: \(C(t)-D(t)=(330-9t)-(230-18t)=100+9t\). The coefficient of \(t\) is 9, so the difference increases by 9 for every one-step increase in \(t\). Option B would be correct only if the coefficient of \(t\) in the difference were \(-9\). Exam tip: When subtracting linear expressions, change the signs of every term in the second bracket.

Related tags

Linear FunctionsLinear DecayPolynomial SubtractionRate Of ChangeAlgebraic ExpressionsLinear Growth And DecayIntroduction To PolynomialsMathematics

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