Question 974465
{{{A=q*2^t}}}
Here, let q=1, for the whole lake surface.
A is the fraction of the lake covered in time t years.
{{{A=1*2^t}}}
{{{highlight_green(A=2^t)}}}
The ten year change should not matter if the first sentence is what happens.


What is t when A=1/4 ?
What is t when A=1 ?