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If (R(t)=b-8t) and (R(6)=42), what is (b)?

Answer and explanation

Correct answer: 90

Given R(6)=42, substitute t=6 in R(t)=b-8t: b-8(6)=42. Thus, b-48=42, so b=42+48=90. Option 84 is incorrect because 48 has not been added back correctly to 42. Exam tip: Substitute the given value of t into a linear expression and then isolate the unknown constant.

Related tags

Linear EquationsLinear DecayPolynomialsSubstitutionInitial ValueLinear Growth And DecayIntroduction To PolynomialsMathematics

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