Measures to reduce air pollution in one city have been worki

Measures to reduce air pollution in one city have been working. In fact, the number of days on which rho carbon monoxide standards were exceeded have decreased by half every 5 years for the 20 years since 1975. In 1975, the standard were exceeded on 41 days. Construct a table of values and formula from this information. If the trend continues, on how many days should we expect the standards to be exceeded in the year 2000.

Solution

So, in 2000 it would be 1.281 days

Year	Exceede Co standards
1975	41
1980	20.5
1985	10.25
1990	5.125
1995	2.5625
2000	1.28125