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If (P(t)=40+4t) and (Q(t)=100-6t), at what (t) will (P(t)) first equal (Q(t))?

Answer and explanation

Correct answer: \(t=6\)

For equality, set \(P(t)=Q(t)\): \(40+4t=100-6t\). Adding \(6t\) to both sides gives \(40+10t=100\), so \(10t=60\) and \(t=6\). Hence, option C is correct. At \(t=5\), \(P(t)=60\) and \(Q(t)=70\), so they are not equal. Exam tip: equate the two expressions first, then collect all terms containing \(t\) on one side.

Related tags

Linear EquationsPolynomialsLinear GrowthLinear DecaySolve For TLinear Growth And DecayIntroduction To PolynomialsMathematics

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