Help algebra 1.... word problem?
andrew measures the amount of a very unstable substance to be 100 moles. the half life of this substance is 3 days (after 3 days, half is gone).
1 write an exponential funtion that models this situation where y is the amount of substance and x is time in days.
2 use your equation to complete the chart. used your data from the chart to graph your euqation.
3calculate the expected amount of substance if andrew had taken his measurement 9 days earlier. show your calculations and consider the trend of your graph.
DAY -3 (3 days prior) 0 3 6 9 12
Amount
Comments
1. 1/2=e^(3k); ln1/2=3k; k=ln1/2/3≈ -0.2310
y=100e^( -0.231x)
2. (-3, 200), (0, 100), (3, 50), (6, 25)...
3. ( -9, 800)