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If (A(t)=72+8t) and (B(t)=111+15t), how does (B(t)-A(t)) change?

Answer and explanation

Correct answer: It increases by 7 per step

Find the difference: \(B(t)-A(t)=(111+15t)-(72+8t)=39+7t\). The coefficient of \(t\) is 7, so the difference increases by 7 whenever \(t\) increases by 1. Here, 39 is the initial difference, not the rate of increase; therefore, the option involving 39 is incorrect. Exam tip: The rate of change of the difference of two linear expressions equals the difference of their \(t\)-coefficients.

Related tags

Linear PolynomialsLinear GrowthDifference Of ExpressionsRate Of ChangePolynomial SubtractionLinear Growth And DecayIntroduction To PolynomialsMathematics

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