Problem:
In January , the Mauna Loa Observatory recorded carbon dioxide levels of ppm (parts per million). Over the years, the average reading has increased by about ppm each year. What is the expected level in ppm in January Round your answer to the nearest integer.
Answer Choices:
A.
B.
C.
D.
E.
Solution:
There are years between and , so we can expect the reading to increase by ppm by . Since the reading in was ppm, then we will have ppm by .
Thus, is the correct answer.
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions