The ____ filters redraw an image or selection by joining, grouping, or clustering pixels of similar color values into cells defined by the tolerance settings.
a. Stylize
b. Pixelate
c. Distort
d. Sketch
b. Pixelate
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Answer the following statements true (T) or false (F)
1. All methods in an abstract class are abstract. 2.. The MustOverride keyword has the same effect as the Overridable keyword. 3. Objects of abstract base classes can be instantiated. 4. A class with MustOverride methods does not necessarily have to be a MustInherit class. 5. An abstract class cannot have instance data and non-abstract methods.
Answer the following questions true (T) or false (F)
1. We can assign a base class object to a derived class variable. 2. Virtual functions allow old code to call new code.
The balance factor of a node in an AVL tree is
a) the number of nodes below it b) the number of nodes above it c) the height of its right subtree minus the height of its left subtree d) the depth of the node from the root e) always positive
You are given the following information about two tables, r and s.
• Table r occupies 800 pages, 20 rows per page, one of its attributes is A • Table s occupies 200 pages, 10 rows per page, one of its attributes is B • Main memory has 52 buffers • _ Table r occupies 800 pages, 20 rows per page, one of its attributes is A • _ Table s occupies 200 pages, 10 rows per page, one of its attributes is B • _ Main memory has 52 bu_ers (a) Compute the minimum cost (measured as the number of I/O operations) of a blocknested • loops join r ZA=B s. Specify how the bu_ers are used and explain your reasoning • carefully. An answer that is just a number gets no credit. (b) Assume there is an unclustered, 3-level, B+ tree index on r with search key A and that each row of s joins with 5 rows of r. Compute the cost of an index-nested loops join. Explain your reasoning carefully. An answer that is just a number gets no credit.