Understanding Variables, Expressions, and Equations

What is a variable in the context of algebra?

• A letter representing a number

• A fixed number

• A mathematical operation

• A type of equation

Which of the following is true about algebraic expressions?

• They are the same as equations

• The variable can take multiple values

• They always have an equal sign

• They have a variable with a fixed value

If x is 2 in the expression x + 5, what is the value of the expression?

• 10

• 7

• 5

• 2

In a linear equation like x + 5 = 8, what is the value of x?

• 3

• 8

• 5

• 0

How many values can a variable have in a quadratic equation?

• One

• Two

• Three

• Four