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If (A(t)=40+6t) and (B(t)=76+3t), at what (t) will (A(t)) be (9) more than (B(t))?

Answer and explanation

Correct answer: \(t=15\)

The condition is \(A(t)=B(t)+9\). So, \(40+6t=76+3t+9\), which gives \(3t=45\) and hence \(t=15\). Checking: \(A(15)=130\) and \(B(15)=121\), so the difference is \(9\). At \(t=14\), the difference is only \(6\), so it is not correct. Exam tip: translate “9 more than” as \(A=B+9\).

Related tags

Linear EquationsPolynomialsLinear GrowthFunction ComparisonAlgebraic ExpressionsLinear Growth And DecayIntroduction To PolynomialsMathematics

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