Answer:
7 plus 12 equals 19.
7 minus 12 equals -5.
7 times 12 equals 84.
7 divided by 12 equals 0,583...
Solution:
Given :
.............(1)
where, B = aP = birth rate
D =
= death rate
Now initial population at t = 0, we have
= 220 ,
= 9 ,
= 15
Now equation (1) can be written as :

.................(2)
Now this equation is similar to the logistic differential equation which is ,

where M = limiting population / carrying capacity
This gives us M = a/b
Now we can find the value of a and b at t=0 and substitute for M
and 
So, 
= 
= 132
Now from equation (2), we get the constants
k = b = 
= 
The population P(t) from logistic equation is calculated by :



As per question, P(t) = 110% of M



Now taking natural logs on both the sides we get
t = 36.216
Number of months = 36.216
Answer:
Step-by-step explanation:
Ok so T = 69
Answer:
the right one is b
Step-by-step explanation:
because if you add all of the other oned it would be 24
The answer is option E i.e., 1 because we know that there are 3 defective batteries in the case so the probability will never be 1 for this case.