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If (M(t)=90-7t), what is the value of (M(t)) at (t=5)?

Answer and explanation

Correct answer: 55

Given \(M(t)=90-7t\). Substituting \(t=5\), \(M(5)=90-7(5)=90-35=55\). Therefore, the correct answer is 55. The value 35 is only \(7\times5\); it must be subtracted from 90. Exam tip: To evaluate a function, substitute the given value for the variable and follow the order of operations carefully.

Related tags

PolynomialsLinear ExpressionFunction EvaluationSubstitutionLinear DecayLinear Growth And DecayIntroduction To PolynomialsMathematics

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