What frequency band is used by bluetooth, 802.11b, and 802.11g?

What percentage of companies is projected to use social media to locate new employees in 2012

How often does colleges update the cost of attendance on their website? . a)every two years b) every four years c) every year d) every semester

The best definition of an idiom is a. a word or phrase that describes a noun b. a word or phrase describing a verb c. a phrase containing figurative language in which the word expresses a different idea from its exact meaning d. a phrase that compares two unlike objects or ideas