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If (A(t)=9+7t), what is the value of (A(t)) at (t=3)?

Answer and explanation

Correct answer: 30

Given \(A(t)=9+7t\). Substituting \(t=3\), we get \(A(3)=9+7\times3=9+21=30\). Hence, the correct answer is 30. The value 21 is only \(7\times3\); the constant term 9 must also be added. Exam tip: To evaluate a function, replace the variable with the given value and simplify step by step.

Related tags

PolynomialsFunction EvaluationSubstitutionLinear ExpressionGrade 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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