A. (pie chart) - correct answer


1. The opportunity to create several equations for launching program files is called
a) creating a file
b) creating a folder
✒ <u>c) creating a directory</u>
d) creating a shortcut
2. Unless you specify otherwise most spreadsheet packages assume all cell addresses are
a) macros
b) relative cell reference
c) absolute cell reference
✒<u> d) mix cell references</u>
3. Which of the following is not a type of lcon
a) program icon
✒ <u>b) document icon </u>
c) folder icon
d) utility icon



Answer:
Join
Explanation:
Five basic set operators in relational algebra are as follows:
- Selection - tuple selection
- Projection - extract columns
- Cartesian product - cross product of relations
- Set union - union of two relations
- Set difference - minus operation on two relations
As we can see, Join is not part of the basic set operations but it is implemented using the Cartesian Product operator.
Answer:
C
Explanation:
A is false because they usually <em>are</em> used to solve problems
B is false because many different algorithms can solve a problem!
C - true
D is false because humans can write an algorithm.