A(n) ________ is a custom program or additional command that is installed to extend the functionality of a Microsoft Office program.
A. template
B. theme
C. add-in
D. gallery
Answer: C
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Use the relational algebra to ?nd the list of all “problematic” classes (i.e., coursesemester pairs) where the failure rate is higher than 20%. (Assume, for simplicity, that grades are numbers between 1 and 4, and that a failing grade is anything less than 2.)
Because the relational algebra does not have aggregate operators, we must add them to be able to solve the above problem. The additional operator you should use is count A/B(r). The meaning of this operator is as follows: A and B must be lists of attributes in r. The schema of count A/B(r) consists of all attributes in B plus one additional attribute, which represents the counted value. The contents of count A/B(r) are de?ned as follows: for each tuple, t ? ?B(r) (the projection on B ), take ?A(?B=t(r)) and count the number of tuples in the resulting relation (where ?B=t(r) stands for the set of all tuples in r whose value on the attributes in B is t ). Let us denote this number by c(t ). Then the relation count A/B(r) is defined as {< t , c(t ) >| t ? ?B(r)}. You should be able to recognize the above construction as a straightforward adaptation of GROUP BY of SQL to the relational algebra.
Match the following terms to their meanings:
I. Clipboard II. Copy III. Paste IV. Home tab V. Clipboard group A. Makes a duplicate version of the table leaving the original table intact B. Can be reached by holding down the ALT key and pressing the letter "H" C. Temporary storage area in Windows D. Home tab area that contains the cut, Format Painter and Clipboard functions E. Moves the copy of the selected table from the Clipboard to a new location
The command-line _______ can be used to install the following features: MicrosoftWindowsPowerShell and NetFx2-ServerCore
Fill in the blank(s) with correct word
____ software identifies malware that tries to install on your computer or device.
A. Antivirus B. Firewall C. Electronic wallet D. Digital certificate