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If (F(t)=50+rt) and (F(3)=F(11)-80), what is (r)?

Answer and explanation

Correct answer: 10

Given \(F(3)=F(11)-80\), we get \(F(11)-F(3)=80\). For the linear function \(F(t)=50+rt\), the change in \(t\) from 3 to 11 is \(8\), so \(F(11)-F(3)=8r\). Thus \(8r=80\), giving \(r=10\). Option 8 is the time interval, not the rate \(r\). Exam tip: subtract two function values in a linear expression to eliminate the constant term 50.

Related tags

Linear FunctionsRate Of ChangeAlgebraic EquationsPolynomialsClass 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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