# Definite Integrals

### Example 1

Let . Use a trapezoid sum with 3 sub-intervals to estimate the area between *f* and the *x*-axis on [0,9]. Is this an overestimate or underestimate?

### Example 2

The table below shows partial values of the function *f* (*x*). Use a trapezoid sum with 4 sub-intervals to estimate the area between the graph of *f* and the *x*-axis on [0,1].