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If g(t) = b - 8t and the sum of g(5), g(9), and g(13) is 288, what is b?

Answer and explanation

Correct answer: 168

The governing concept is substitution into a linear expression and collection of like terms. Calculate the three values: g(5) = b - 8(5) = b - 40, g(9) = b - 72, and g(13) = b - 104. Their sum is (b - 40) + (b - 72) + (b - 104) = 3b - (40 + 72 + 104) = 3b - 216. The given condition therefore becomes 3b - 216 = 288. Adding 216 to both sides gives 3b = 504, and dividing by 3 gives b = 168. Thus option D is correct. The distractors can arise from adding only some subtracted terms, treating b as appearing once, or making an arithmetic error when solving the final equation.

Related tags

Linear FunctionSubstitutionLinear DecayLinear Growth And DecayIntroduction To PolynomialsMathematicsClass 9 Mcq

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