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If water left in a tank is (L(t)=60-3t) litres, how much water was there at (t=0)?

Answer and explanation

Correct answer: 60 litres

To find the initial amount, put t=0: L(0)=60-3(0)=60 litres. Therefore, the correct answer is 60 litres. The value 57 litres is obtained at t=1, when 3 litres have already decreased. Exam tip: in a linear expression a+bt, the value at t=0 is the constant term a.

Related tags

PolynomialsLinear ExpressionInitial ValueLinear DecaySubstitutionLinear Growth And DecayIntroduction To PolynomialsMathematics

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