Question 984285
{{{p=900*(1.05)^t}}}
p, population
t, time in years
Let p=1200
Solve for t.



Comments About Other Questions:
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The formula or equation shown can be derived from earlier and simpler principles, finding the pattern, and then simplifying.
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The dot between the 900 and the (1.05)  shows up upon rendering without regard to being included in what we type.  On paper, we may include the dot, or not.
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What is p=1200 ?
Read the problem description.  How much time for the population to return to 1200; the growth equation is for 5% growth rate starting with population 900, and returning to the fox's previous 1200 population.  
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You can use any calculator that you want or are allowed.  Try to choose a scientific calculator.  You could use a graphing calculator but these are more expensive than you should need, since scientific calcs are much cheaper.