Let x and y be strings and let l be any language. we say that x and y are distinguishable by l if some string z exists whereby exactly one of the strings xz and yz is a member of l; otherwise, for every stringz, we havexz ∈ l whenever yz ∈ l and we say that x and y are indistinguishable by l. ifx and y are indistinguishable by l, we writex ≡l y. show that≡l is an equivalence relation.

Match the following. 1. show grouping of word processing tasks that can be performed quick access toolbar 2. shortcut location for commonly used elements scroll bars 3. organized commands used to modify documents ribbon 4. used to align and measure content in a word screen zoom bar 5. vertical and horizontal bars that are used to navigate through a document contextual tabs 6. displays the name of the document in use ruler 7. allows users to enlarge or shrink a visual of a word document title bar

Research data that is presented using descriptive language is said to be

Which of the following is not a way in which trees benefit the environment? a. they remove a significant amount of carbon dioxide from the atmosphere. b. they remove a significant amount of oxygen from the atmosphere. c. their roots hold soil in place, reducing rates of erosion. d. they remove ozone and particulates from the atmosphere. select the best answer from the choices provided a b c d