Evaluate the following expressions
A. (4 - 7) * 3
B. 14 % 4
C. 24 / 9
D. 6.72 / 4.2
E. 2 + 8 * 3 + 7
A. -9
B. 2
C. 2
D. 1.6
E. 33
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Explain why serial equivalence requires that once a transaction has released a lock on an object, it is not allowed to obtain any more locks.
A server manages the objects 
. The server provides two operations for its clients:
read (i) returns the value of 
write(i, Value) assigns Value to
The transactions T and U are defined as follows:
T: x= read (i); write(j, 44); U: write(i, 55);write(j, 66);
U: write(i, 55);write(j, 66);
Describe an interleaving of the transactions T and U in which locks are released early with the effect that the interleaving is not serially equivalent.
In the accompanying figure, which line of code always adds a page break after a figure element?
A. 1 B. 5 C. 3 D. 4
While viewing Web pages, you can navigate from page to page using the Forward and Back buttons, and you can use the ____________________ menu to return to your home page or to view a list of previously viewed Web pages.
Fill in the blank(s) with the appropriate word(s).
You use the __________ pseudo-class to apply styles to elements that do not have therequiredattribute.
A. :focus B. :checked C. :optional D. :valid