# How do you evaluate the function f(x) = 7x - 1/4 for f(3/4)?

$5$
Replace x with $\frac{3}{4}$ to get
$f \left(\frac{3}{4}\right) = 7 \left(\frac{3}{4}\right) - \frac{1}{4}$
$= \frac{21}{4} - \frac{1}{4} = \frac{20}{4} = 5$