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If (P(t)=70+5t) and (Q(t)=190-10t), at which (t) will (P(t)=Q(t))?

Answer and explanation

Correct answer: \(t=8\)

Equating the two expressions gives \(70+5t=190-10t\). Moving \(10t\) to the left gives \(15t=120\), so \(t=8\). Substituting \(t=6\) does not make the two values equal, so that nearby option is incorrect. Exam tip: first equate both functions, then collect all terms containing \(t\) on one side.

Related tags

Linear EquationsPolynomialsLinear GrowthLinear DecayAlgebraic EqualityTime VariableLinear Growth And DecayIntroduction To Polynomials

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