Ex. 11. Answer the following questions

1. What is the relationship between arithmetic and algebra? 2. In what arithmetic operations do we use numbers? 3. What do we use in algebra to represent numbers? 4. What examples of the close relationship between arithmetic and algebra can you give? 5. What is algebra? 6. What is the outstanding characteristic of algebra? 7. Name algebraic expressions you know. 8. When are two terms called similar? 9. What signs are used in algebra and what do they indicate? 10. How is the sign () read? 11. What is the meaning of the multiplication sign, the equality sign and the division sign? 12. What does the expression (a + b) mean?