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If (P(t)=55+5t) and (Q(t)=135-3t), at which (t) will (P(t)=Q(t))?

Answer and explanation

Correct answer: \(t=10\)

For equality, write \(55+5t=135-3t\). Moving \(3t\) to the left and 55 to the right gives \(8t=80\), so \(t=10\). Substituting \(t=8\) does not make the two values equal, so it is a close but incorrect distractor. Exam tip: collect all terms containing \(t\) on one side and constant terms on the other.

Related tags

Linear EquationsPolynomial EvaluationSolving EquationsLinear Growth And DecayIntroduction To PolynomialsMathematicsClass 9 Mcq

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