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In the model (R(t)=r-18t), (R(3)=166) and (R(s)=40). What is (s)?

Answer and explanation

Correct answer: 10

Given R(t)=r-18t. Substituting R(3)=166 gives r-18(3)=166, so r-54=166 and r=220. Now, using R(s)=40, we get 220-18s=40. Thus, 18s=180 and s=10. If s=9, then R(9)=58, not 40. Exam tip: first find the constant r from one condition, then substitute it into the second condition to solve for the variable.

Related tags

Linear DecayLinear EquationsPolynomial IntroductionSubstitutionSolve For VariableLinear Growth And DecayIntroduction To PolynomialsMathematics

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