This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
Koichi doesn't know the accurate number of WaniKani users.
Michael completed his mission to memorize Koichi's lunch request perfectly and order it.
Actually, I’m pretty annoyed at how you have a comeback for everything and how what you say is so accurate.