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If (U(t)=9t+14), what is (U(t)) at (t=7)?

Answer and explanation

Correct answer: 77

Given U(t)=9t+14, substitute t=7: U(7)=9×7+14=63+14=77. Hence, 77 is the correct option. The value 63 is only 9×7 and does not include the constant term 14. Exam tip: To evaluate a function, substitute the given input first and then follow the order of operations.

Related tags

PolynomialsLinear ExpressionFunction EvaluationSubstitutionLinear GrowthLinear Growth And DecayIntroduction To PolynomialsMathematics

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