Question 48·Hard·Nonlinear Functions

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f(x)=12(5)^{2x-3}

The function $f$ is defined above, and another function $g$ is defined by

g(x)=\frac{1}{60}\,f\!\left(\frac{x}{2}+1\right).

Which of the following equations expresses $g$ in the form $g(x)=k\,b^{\,x}$ for constants $k$ and $b$ ?

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