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If F(t) = 72 − 8t, what is the magnitude of the decay rate?

Answer and explanation

Correct answer: 8

A linear growth or decay model can be written as F(t)=F(0)+rt, where F(0) is the initial value and r is the signed rate of change. Comparing this with F(t)=72−8t gives F(0)=72 and r=−8. The negative sign indicates decay: when t increases by one unit, F decreases by 8 units. However, the question asks for the magnitude, which is the nonnegative size of the rate. Therefore |r|=|−8|=8, so option A is correct. Option B is the signed rate rather than its magnitude. Option C is the initial value, not a rate, while option D is unrelated to the coefficient of t.

Related tags

Linear Growth And DecayDecay RateMagnitudeCoefficientIntroduction To PolynomialsClass 9 McqMathematics

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