**Approximate the area between the $x$-axis and $f(x)$ from $x = 0$ to $x = 9$ using a *trapezoidal sum* with $3$ equal subdivisions.** | | ||| :-: | - | - | - | $x$ | $0$ | $3$ | $6$ | $9$ $f(x)$ | $2$ | $5$ | $7$ | $11$ The approximate area is [[☃ numeric-input 1]] units$^2$.