log10(10) + log10(100) + log10(1000) + log10(10000) + log10(100000) is equal…

Key idea: use the fact that log base 10 of 10^n equals n.

1. Evaluate each logarithm:

   log10(10) = 1, log10(100) = 2, log10(1000) = 3, log10(10000) = 4, log10(100000) = 5.

2. Add the results:

   1 + 2 + 3 + 4 + 5 = 15.

Answer: 15