Show that the class P, viewed as a set of languages, is closed under union, inter- section, concatenation, complement, and Kleene star. That is, if L1,L2 ∈ P, then L1 ∪ L2 ∈ P, etc.

When building customer relationships through email what should you not do? question 2 options: utilize proper grammar, spelling, and punctuation type in all capital letters use hyperlinks rather than attachments respond to all emails within 24 hours

Octothorpe is another name for what common computer keyboard symbol?

Technician a says that with self-adjusting clutch systems, the release bearing constantly rotates. technician b says that the ball bearing portion of the release bearing should be lubricated with high-temperature grease during routine maintenance. which technician is correct?