Answer:
all of these are observable.
Step-by-step explanation:
you can look into how algae increase in the summer. You can visually see the water level is lower and you can feel the temperature of the water
We have no idea how much is one faithful of a barrel.
Answer:
2.60 gr
Step-by-step explanation:
We need to consider the function where Po is the initial substance k is the rate of decay and t is the time
We know that and at the 7 th year P(t) is 7
This means
We solve for k