S = 10000 x 1.05^t
Solve that is .
gives and gives , so years.
Solve . gives and gives . So years.
. Table: if , then € 3810.58 and if , then € 4001.11. So years ago.
Yes, you could choose .
No, there is a horizontal asymptote .
, so .
year before 6-1-1997 the radiation was Bq.
years after 6-1-1997 the readiation was Bq.
years ago the radiation was Bq. So .
Solve . months gives and months gives 0.4883. So after months and days, so from 22-2-1998.
and
Enter: Y1=2000*1.04^X and Y2=1500*1.06^X. Window: X from 0 to and Y from 0 to 1000.
You find years. This is years and month after 1-1-2000, so from 1-3-2015.
Both curves go through .
For curve : at the function has the value = and at the value 40, so .
For curve : at the function has the value = and at the value 90, so .
Intersecting and gives .
So after years.