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If D(t) = 88 - 4t, by how much will D(t) decrease when t increases by 1?

Answer and explanation

Correct answer: 4

The governing idea is the constant rate of change of a linear function. In D(t) = 88 − 4t, the coefficient of t is −4, so increasing t by one unit changes D by −4. This can be shown directly: D(t+1) = 88 − 4(t+1) = 88 − 4t − 4 = D(t) − 4. Therefore the new value is 4 units smaller than the old value, and the amount of decrease is the positive number 4. Option C is correct. Option B, −4, is the signed change, not the amount by which the function decreases. Option A is the constant term and option D is not a general change; it could only be a value for a particular input, not the requested one-unit decrease.

Related tags

Linear-FunctionsRate-Of-ChangeDecayCoefficientsLinear Growth And DecayIntroduction To PolynomialsMathematicsClass 9 Mcq

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