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.

Ingrid started speaking about her slide presentation. when she clicked to th"third slide, which had just a picture of an elephant, she forgot what she wassupposed to talk about. what could ingrid do to avoid this situation in thefuture? oa. print handouts for her audience.ob. add presenter's notes to each slide.oc. add a video to each slide.od. save her slide presentation to a flash drive

How can smart devices benefit businesses, organizations, and social communities in the global marketplace?

Which relativos possible when two tables share the same primary key? a.) one-to-one b.) one-to-many c.) many-to-one d.) many-to-many