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If (P(t)=90+8t), (P(7)+P(19)) is equal to twice which (P(k))?

Answer and explanation

Correct answer: \(P(13)\)

This is a linear function. The midpoint of 7 and 19 is \(\frac{7+19}{2}=13\), so \(P(7)+P(19)=2P(13)\). Checking directly, \(P(7)=146\) and \(P(19)=242\), giving a sum of \(388\); also, \(P(13)=194\) and \(2\times194=388\). \(P(12)\) is a close distractor, but 12 is not the midpoint of the two given inputs. Exam tip: for a linear function, the average of two function values equals the function value at the midpoint of their inputs.

Related tags

Linear FunctionsPolynomialsMidpoint PropertyLinear GrowthAlgebraic ReasoningLinear Growth And DecayIntroduction To PolynomialsMathematics

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