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If (Q(t)=420-12t), (Q(6)+Q(18)) is equal to twice which (Q(k))?

Answer and explanation

Correct answer: Q(12)

This is a linear function. The midpoint of 6 and 18 is 12, so for a linear function, Q(6)+Q(18)=2Q(12). Checking directly, Q(6)=348 and Q(18)=204, giving a sum of 552. Also, Q(12)=276, so 2Q(12)=552. Q(11) is not the midpoint, so it cannot be correct. Exam tip: For a linear function, the sum of the values at two inputs equals twice the value at their midpoint.

Related tags

Linear FunctionMidpoint PropertyPolynomialsLinear DecayAlgebraic EvaluationLinear Growth And DecayIntroduction To PolynomialsMathematics

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