Solve that is . gives and gives , so years.
Solve . gives and gives . So years.
. Using GC 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 radiation was Bq.
years ago the radiation was Bq. So .
Solve .
months gives en months gives Bq. so after months and days, from 22-2-2020.
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.