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If (Q(t)=210-7t), (Q(3)+Q(15)) is equal to twice which (Q(k))?

Answer and explanation

Correct answer: Q(9)

This is a linear function. The midpoint of 3 and 15 is \(\frac{3+15}{2}=9\), so for a linear function, \(Q(3)+Q(15)=2Q(9)\). Checking directly, \(Q(3)=189\) and \(Q(15)=105\), giving a sum of \(294\), while \(2Q(9)=2\times147=294\). Hence, Q(9) is correct. Q(10) is not the midpoint, so twice its value is not equal to the given sum. Exam tip: For a linear function, the sum of outputs at two equally spaced inputs equals twice the output at their midpoint.

Related tags

Linear FunctionLinear DecayMidpoint PropertyPolynomialsAlgebraic ExpressionsLinear Growth And DecayIntroduction To PolynomialsMathematics

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