Derivatives · Exercise 132

Explain the notation in words when the height of a projectile in feet, $s,$ is a function of time $t$ in seconds after launch and is given by the function $s\left(t\right).$

$\frac{s\left(2\right)-s\left(1\right)}{2-1}$

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Precalculus 2e · §12.4 Derivatives · Exercise 132