Evaluating Expressions with Variables

Front

What is a variable in mathematics?

Back

A symbol, often a letter, that represents a number in an expression or equation.

Front

Evaluate the expression: 4(f-5) if f=7.

Back

8

Front

What does it mean to evaluate an expression?

Back

To calculate the value of an expression by substituting variables with their values.

Front

Evaluate the expression: x² - 2x if x=4.

Back

8

Front

What is the expression for the number of students not chosen if S students try out for baseball and 13 are chosen?

Back

s - 13

Front

Evaluate the expression: 2n + 3 + n if n=3.

Back

12

Front

What is the value of the expression 24 + s if s=10?

Back

34

Front

What is an expression in mathematics?

Back

A combination of numbers, variables, and operations without an equality sign.

Front

What is the difference between an expression and an equation?

Back

An expression does not have an equality sign, while an equation does.

Front

If a variable represents a number, how do you substitute it in an expression?

Back

Replace the variable with the number it represents.