Verified Answer :

dalendrk

\(f(x)=3x\\\\subtitute\ x=\dfrac{1}{2}\\\\f(\frac{1}{2})=3\cdot\dfrac{1}{2}=\boxed{\frac{3}{2}=1.5}\\\\subtitute\ x=\dfrac{1}{4}\\\\f(\frac{1}{4})=3\cdot\dfrac{1}{4}=\boxed{\frac{3}{4}}\)

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