### Home > A2C > Chapter 4 > Lesson 4.1.3 > Problem 4-42

Scientists can estimate the increase in carbon dioxide in the atmosphere by measuring increases in carbon emissions. In 1998 the annual carbon emission was about eight gigatons (a gigaton is a billion metric tons). Over the last several years, annual carbon emission has been increasing by about one percent. Homework Help ✎

At this rate, how much carbon will be emitted in 2010?

Write a function,

*C(x),*to represent the amount of carbon emitted in any year starting with the year 2000.

What multiplier will you use for something that is increasing by 1%?

9.015 gigatons

You can either calculate the begining amount for 2000 and let time = *x* or

you can let the beginning amount be the same as in 1998 and let time = *x* + 2.

*C*(*x*) = 8(1.01)^{(}^{x}^{ + 2)} or 8.16(1.01)^{x}