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If (R(t)=b-6t) and (R(5)=50), what is (b)?

Answer and explanation

Correct answer: 80

Given \(R(t)=b-6t\). Substituting \(t=5\) gives \(R(5)=b-6(5)=b-30\). Since \(R(5)=50\), \(b-30=50\), so \(b=80\). Option 50 is the value of \(R(5)\), not the value of \(b\). Exam tip: When a function value is given, first substitute the stated input into the formula and form an equation.

Related tags

Linear FunctionLinear DecayInitial ValueSubstitutionPolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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