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If (C(t)=150-3t) and (D(t)=120-8t), how does (C(t)-D(t)) change?

Answer and explanation

Correct answer: It increases by 5 each step

Subtracting gives \(C(t)-D(t)=(150-3t)-(120-8t)=30+5t\). Thus, for every increase of 1 in \(t\), the difference increases by 5. Option B is incorrect because \(D(t)\) decreases 5 units faster than \(C(t)\), so the gap between them increases. Exam tip: When subtracting linear expressions, change the signs of every term in the second bracket carefully.

Related tags

Linear PolynomialsLinear Growth And DecaySubtraction Of PolynomialsRate Of ChangeAlgebraic ExpressionsIntroduction To PolynomialsMathematicsClass 9 Mcq

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