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If (Q(t)=320-8t), (Q(5)+Q(17)) is equal to twice which (Q(k))?

Answer and explanation

Correct answer: \(Q(11)\)

The function \(Q(t)=320-8t\) is linear. The midpoint of \(5\) and \(17\) is \(\frac{5+17}{2}=11\), so for a linear function, \(Q(5)+Q(17)=2Q(11)\). Hence, \(Q(11)\) is correct. \(Q(10)\) is a close distractor, but 10 is not the midpoint of 5 and 17. Exam tip: In such questions, find the average of the two inputs to determine \(k\).

Related tags

Linear FunctionsPolynomialsMidpoint PropertyAlgebraic ExpressionsGrade 9 MathematicsLinear Growth And DecayIntroduction To PolynomialsMathematics

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