In the past week, readers from the Wichita area and around the country have responded to our appeal for questions about the BTK serial killer case.Of the several hundred questions we've received, many will likely be answered at Dennis Rader's Aug. 17 sentencing hearing. Answers to other questions can be found in the extensive Kansas.com archives of the Eagle's BTK coverage, but bear repeating here for those who haven't followed the case as closely as many Wichitans have. And a few questions — especially those about Rader's most private motivations and decisions — may never be answered.