The above is a query in my maths textbook within the subject matter Exponential increase & Decay.
i am a piece confused as to how I have to technique this query.
We have been taught to use the formula:
Where Q is the quantity, A is the initial quantity, k is the growth/decay constant and t is the time.
In reference to the question, I don't think I need A so here is the equation I ended up with:
I found out that
I then let Q=3A and the following is my working:
I can't figure out what is wrong in my working out.
The provided answer is: 39.6 years