silvernight269:

in 1972, federal vehicle emission standards allowed 3.4 hydrocarbons released per mile driven. By 2007 the standards allowed only 0.8 hydrocarbons per mile driven. What was the rate of change from 1972 to 2007

8 months ago
silvernight269:

@Vocaloid

8 months ago
silvernight269:

@dude @umm @Ultrilliam

8 months ago
umm:

About -0.07/year

8 months ago
silvernight269:

but how would i get that answer

8 months ago
silvernight269:

@Vocaloid

8 months ago
umm:

make 1972 your starting point so y=0 and then the hydro your x so x=3.4 then you have (3.4,0) then 2007 is 35 years after 1972 so y=35 and x=0.8 (0.8,35) then use then point slope formula

8 months ago
silvernight269:

ok......

8 months ago
Ultrilliam:

@Mehek @dude

8 months ago