### Home > APCALC > Chapter 6 > Lesson 6.4.1 > Problem 6-120

6-120.

Suppose that represents the cost per day to heat a given house measured in dollars, where

*is measured in days and*

*corresponds to January 1, 2016. Interpret the expressions below:*

The second expression divides the first integral by

What practical information will it calculate about the cost of heat?

The first integral represents the area under the curve between

*and*

*.*

Since

*represents cost per day, its a rate function.*

The area under this rate function represents the accumulated cost during the