Problem: Write the following statement as an algebraic expression.

A number is decreased by ten and the result is multiplied by 2.

Solution:

(x-10)*2= x*2-10*2 = = 2x-20

Answer the following question(s).

1. From the Algebraic Statement, "A number" is represented by...?

2. What are the common English letters used to represent a variable?

3. What are the letters that should not be used?

4. Identify the Algebraic property used to simplify the algebraic expression in the given problem.

5. What are the different Algebraic properties? Define them.