Answer: That would be 15ft
Given the exponential function:

The starting point is found when x = 0.
So, let's substitute x by 0.

Answer: The starting point is (0, 1.004).
I would think this is many solutions, the reason is because, there is no specific answer (y) so, x could be anything because it would have to equal to y, which could also be anything! I hope im right! Sorry if im wrong!