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If (A(t)=34+5t) and (B(t)=55+9t), how does (B(t)-A(t)) change?

Answer and explanation

Correct answer: It increases by 4 per unit time

Find the difference: \(B(t)-A(t)=(55+9t)-(34+5t)=21+4t\). The coefficient of \(t\) is 4, so the difference increases by 4 whenever \(t\) increases by 1. Here, 21 is the initial difference, not the rate of increase; therefore, option D is incorrect. Exam tip: The rate of change of the difference of two linear expressions is the difference of their \(t\)-coefficients.

Related tags

Linear PolynomialsRate Of ChangeDifference Of FunctionsAlgebraic ExpressionsLinear GrowthLinear Growth And DecayIntroduction To PolynomialsMathematics

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