Lossless audio compression produces a representation of digital data that decompress to an exact digital duplicate of the original audio stream, unlike playback from lossy compression techniques such as Vorbis and MP3. Compression ratios are around 5060% of original size, which is similar to those for generic lossless data compression. Lossless compression is unable to attain high compression ratios due to the complexity of waveforms and the rapid changes in sound forms. Codecs like FLAC, Shorten and TTA use linear prediction to estimate the spectrum of the signal. Many of these algorithms use convolution with the filter [-1 1] to slightly whiten or flatten the spectrum, thereby allowing traditional lossless compression to work more efficiently. The process is reversed upon decompression.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What are three Codecs that use linear prediction to estimate the decompression?
Ah, so.. unanswerable

Kathmandu(/ktmndu/; Nepali pronunciation: [kmu]) is the capital and largest municipality of Nepal. It also hosts the headquarters of the South Asian Association for Regional Cooperation (SAARC). It is the only city of Nepal with the administrative status of Mahanagar (Metropolitan City), as compared to Upa-Mahanagar (Sub-Metropolitan City) or Nagar (City). Kathmandu is the core of Nepal's largest urban agglomeration located in the Kathmandu Valley consisting of Lalitpur, Kirtipur, Madhyapur Thimi, Bhaktapur and a number of smaller communities. Kathmandu is also known informally as "KTM" or the "tri-city". According to the 2011 census, Kathmandu Metropolitan City has a population of 975,453 and measures 49.45 km2 (19.09 sq mi).
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How many people lived in Kathmandu in 2011?
Ah, so.. 975,453

Governments of Republic of Turkey since that time have consistently rejected charges of genocide, typically arguing either that those Armenians who died were simply in the way of a war or that killings of Armenians were justified by their individual or collective support for the enemies of the Ottoman Empire. Passage of legislation in various foreign countries condemning the persecution of the Armenians as genocide has often provoked diplomatic conflict. (See Recognition of the Armenian Genocide)
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who ruled Turkey when the Armenian genocide happened?
Ah, so..
the Ottoman Empire