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OpenStudy (anonymous):

A pre-industrial level of a certain gas in the atmosphere was 302 ppm. If the function f(x) = 423(1.002)^x projects the concentration of this gas ( in ppm) in the atmosphere x years after the year 2003, in what year will the concentration reach 1.80 times the pre-industrial level ?

OpenStudy (anonymous):

Multiply your pre-industrial level by 1.80. Sub that in for f(x), solve for x.

OpenStudy (anonymous):

thank you i will try that :)

OpenStudy (anonymous):

1.80*302=423(1.002)^x use logarithms to solve it.

OpenStudy (anonymous):

thanks :)

OpenStudy (anonymous):

you're welcome. :)

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