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If (F(t)=45+rt) and (F(2)=F(9)-63), what is (r)?

Answer and explanation

Correct answer: 9

Given \(F(2)=F(9)-63\), we get \(F(9)-F(2)=63\). For the linear function \(F(t)=45+rt\), \(F(9)-F(2)=(45+9r)-(45+2r)=7r\). Hence \(7r=63\), so \(r=9\). Option 7 is the time interval \(9-2\), not the rate \(r\). Exam tip: taking the difference of two function values cancels the constant term.

Related tags

Linear FunctionsSlopeRate Of ChangePolynomial IntroductionAlgebraic EquationsLinear Growth And DecayIntroduction To PolynomialsMathematics

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