12
11
\(\frac{11}{2}\)
\(\frac{9}{2}\)
Correct answer is C
\(f(x) = 2x - 1; g(x) = x^{2} + 1\)
\(f(x) = 2x - 1\)
\(f(y) = 2y - 1 \)
\(x = 2y - 1 \implies 2y = x + 1\)
\(y = \frac{x + 1}{2}\)
\(g(3) = 3^{2} + 1 = 10\)
\(f^{-1}(10) = \frac{10 + 1}{2} = \frac{11}{2}\)
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