• Answers:
1. Which of the following is a variable?
• Variable is a symbol used to represent an unknown number. Letters x and y are the common used variables although you can use any letter.
[tex] \large \boxed{ \tt B. \: y}[/tex]
2. Which is constant in this expression? πr²
• Constant has a fixed value (does not change).
[tex] \large \boxed{ \tt A. \: π}[/tex]
3. Which of the following can be used as variables?
[tex] \large \boxed{ \tt D. \: All \: of \: these}[/tex]
Again, you can use any letters as variables.
4. Any symbol representing one fixed value that does not change is called ___?
[tex] \large \boxed{ \tt B. Constant}[/tex]
5. What do you call to the letters or symbols that represents a number?
[tex] \large \boxed{ \tt C. Variable}[/tex]
