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Water left in a tank is (W(t)=180-12t) litres. How much water will remain at (t=9)?

Answer and explanation

Correct answer: 72 litres

Given \(W(t)=180-12t\). Substituting \(t=9\), \(W(9)=180-12(9)=180-108=72\) litres. Therefore, 72 litres is correct. The nearby distractor 84 litres does not result from substituting 9 correctly in the given expression. Exam tip: in a linear decay expression, substitute the time value first, multiply, and then subtract the decrease from the initial amount.

Related tags

Linear DecayLinear PolynomialSubstitutionAlgebraic ExpressionsWord ProblemsLinear Growth And DecayIntroduction To PolynomialsMathematics

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