Expressions and Equations

What is the definition of "expression"?

• a math sentence with an equals sign

• a math sentence showing that two expressions are equal

• a math sentence with at least 2 numbers or variables and at least 1 operation

• the absolute value of a number

What is the definition of "equation"?

• a math sentence that shows two expressions are equal

• a math sentence with at least 2 numbers or variables and at least 1 operation

• an unknown number

• the absolute value of a number

Which of the following are possible definitions of "variable"? Choose all that apply

• an unknown number

• a symbol representing an unknown number

• something that can change

• a symbol representing something that can change

True or False: variables always have the same value

• True

• False

Which of the following is an expression? Choose all that apply.

• 52

Which of the following is an equation? Choose all that apply.

• 52

Write an expression

Write an equation

What is "absolute value"? Choose all that apply

• a number's distance from zero on the number line.

• the number part of a number (ignoring the sign)

• the negative version of a number

• the square root of the number