Question 597191
Suppose the amount of ozone is given by P = Ce-.0025t, where t is
measured in years. How long will it take for 70% of the ozone to disappear? (Round to the nearest yr.)
is it like c=100 and then i solve for t and P= 70%
-----
The statement of the problem seems to imply that
P is the percent of ozone and C is the current amount.
---
If that is true, solve:
0.70C = C*e^-0.0025t
---
e^-0.0025t = 0.70
---
Take the log to get:
-0.0025t = ln0.70 = -0.35667...
The t = 142.7 years
=======================
Cheers,
Stan H.