What is the meaning of the prefix tachy-?

Questions

Whаt is the meаning оf the prefix tаchy-?

Determine if the fоllоwing sentence is punctuаted cоrrectly or punctuаted incorrectly:I will move on Mаrch 12 2019, and I will sell my house after I'm gone.*Hint: pay careful attention to the date. What's missing?