The answer is 1
I'm not sure what letter though because you wrote both a and c as 1
Here is a good way to think about it
\(10^{4} =10000\)
\(10^{3} =1000\)
\(10^{2} =100\)
\(10^{1} =10\)
\(10^{0} =1\)
\(10^{-1} =.1\)
\(10^{-2} =0.01\)
\(10^{-3} =0.001\)
\(10^{-4} =0.0001\)
