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If (U(t)=5t+15), what is (U(t)) at (t=7)?

Answer and explanation

Correct answer: 50

Given \(U(t)=5t+15\). Substituting \(t=7\), \(U(7)=5\times7+15=35+15=50\). Therefore, 50 is correct. Getting 45 is incorrect because adding 15 to \(5\times7=35\) gives 50. Exam tip: To find a function value, substitute the given number for the variable, then follow the order of operations.

Related tags

PolynomialsLinear ExpressionFunction EvaluationSubstitutionLinear GrowthLinear Growth And DecayIntroduction To PolynomialsMathematics

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