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What is a variable?
A variable is a letter that represents a number

What is an algebraic expression?
 An algebraic expression is a number, variable or combination of the two connected by some mathematical operation like addition, subtraction, multiplication, division, exponents, and/or roots.
 ex: 2x + y, a/5, and 10  r are all examples of algebraic expressions

How do you evaluate an expression?
evaluate an expression by replacing the variable with the given number and performing the indicated operation

Finding the value of an expression
When you are asked to find the value of an expression, that means you are looking for the result that you get when you evaluate the expression

Addition
sum, plus, add to, more than, increased by, total

Subtraction
difference of, minus, subtracted from, less than, decreased by, less

Multiplication
product, times, multiply, twice, of

Division
quotient divide, into, ratio


