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#### 432**Question:** A linguist is studying the evolution of language through a model where the frequency of a certain linguistic feature in a population is given by the function \( f(t) = 3t^2 - 2t + 5 \). Find the time \( t \) at which the frequency is 20.

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\[ x^2 + bx + c = 0 \]

\[ 3k + 2k = 5k = -b \]

\[ b = -5k \]

\[ (3k)(2k) = 6k^2 = c \]

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