### Home > CALC > Chapter 7 > Lesson 7.2.3 > Problem 7-89

7-89.

Given the equations of the river banks, determine the area of land.

**North Bank:** *y* = cos

**South Bank: ***y *= ln(9 − *x*) Homework Help ✎

The *x*-axis is the line pointing east, and the *y*-axis is the line pointing north.

Set up an integral to find the area of the Northern region first.

Note that this will be the area between a horizontal line (on top) and a curvy line (on the bottom).

The area of the Southern region will be easier to set up.