# Question of the Day – Math #4

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Today’s Question of the Day — Math Section #4

A radioactive substance decays at an annual rate of 11 percent.  If the initial amount of the substance is 250 grams, which of the following functions f models the remaining amount of the substance, in grams, t years later?

A) $f(t)=250(0.11)^{t}$

B) $f(t)=250(0.89)^{^{t}}$

C) $f(x)=0.11(250)^{t}$

D) $f(x)=0.89(250)^{t}$