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If (P(t)=50+4t), (P(4)+P(12)) is equal to twice which (P(k))?

Answer and explanation

Correct answer: \(P(8)\)

Given \(P(t)=50+4t\), we get \(P(4)=66\) and \(P(12)=98\). Thus, \(P(4)+P(12)=164\), and half of this is \(82\). Since \(P(8)=50+4\times8=82\), we have \(P(4)+P(12)=2P(8)\). Although \(P(7)=78\) is close, twice it is \(156\), so it is not correct. Exam tip: for a linear function, the function value at the midpoint of two inputs equals the average of the two function values.

Related tags

Linear FunctionsPolynomialsMidpoint PropertyFunction EvaluationAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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