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If (F(t)=32+rt) and (F(3)=F(8)-40), what is (r)?

Answer and explanation

Correct answer: 8

Given \(F(t)=32+rt\), we have \(F(3)=32+3r\) and \(F(8)=32+8r\). Substituting these into \(F(3)=F(8)-40\) gives \(32+3r=32+8r-40\). Hence, \(5r=40\), so \(r=8\). If \(r=10\), the change from \(t=3\) to \(t=8\) would be 50, not 40. Exam tip: for a linear function, the change over an interval equals \(r\) multiplied by the time interval.

Related tags

Linear FunctionsPolynomialsRate Of ChangeAlgebraic EquationsLinear GrowthLinear Growth And DecayIntroduction To PolynomialsMathematics

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