So 0.25 is essentially 25/100. Divide 25 from the top and bottom to get 1/4
Answer:
The half-life of the radioactive substance is 135.9 hours.
Step-by-step explanation:
The rate of decay is proportional to the amount of the substance present at time t
This means that the amount of the substance can be modeled by the following differential equation:
Which has the following solution:
In which Q(t) is the amount after t hours, Q(0) is the initial amount and r is the decay rate.
After 6 hours the mass had decreased by 3%.
This means that 
. We use this to find r.
So
Determine the half-life of the radioactive substance.
This is t for which Q(t) = 0.5Q(0). So
The half-life of the radioactive substance is 135.9 hours.
20 animals - 2 rabbits = 18 animals
18 animals + 2 gerbils = 20 animals.
20 animals / 4 = 5 animals
There are 5 rabbits and 15 gerbils now.
At the start 2 rabbits were sold so add that on.
5 + 2 = 7
There were 7 rabbits.
There weren't any twin gerbils then.
15 - 2 = 13.
There were 13 gerbils and 7 rabbits to start with.
Hope This Helps You!
Good Luck Studying :)
Answer:
x = 13
Step-by-step explanation:
x and 167 are a linear pair, x plus 167 will equal 180
x + 167 = 180
x = 180 - 167
x = 13
To check: x + x + 167 + 167 = 360
x = 13
13 + 13 + 167 + 167 = 360
26 + 167 + 167 = 360
26 + 334 = 360
360 = 360
Answer:
I think the answer is a because it not getting any smaller
