Posted by **Sherkyra8645** on Monday, December 13, 2010 at 8:12pm.

1). In 1968, vehicle emision standards allowed 6.3 hydrocarbons released per mile driven. By 1980, the standards allowed only 0.41 hydrocarbons per mile driven. What was the rate of change from 1968 to 1980?

- Math -
**Ms. Sue**, Monday, December 13, 2010 at 8:15pm
(6.3 - 0.41) / 6.3 =

Convert the decimal answer to a percent.

- Math -
**Sherkyra8645**, Monday, December 13, 2010 at 8:24pm
Thank you! Would it be...

0.93?

- Math -
**Ms. Sue**, Monday, December 13, 2010 at 8:26pm
Yes -- if you change the decimal to a percent.

0.93 = 93% decrease

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