WRITING AND EVALUATING EXPRESSIONS

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (such as +, -, *, /) that represents a value.

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with numbers and performing the operations.

Front

What is the sum of two numbers?

Back

The sum is the result of adding two or more numbers together.

Front

How do you write 'twice a number x' as an expression?

Back

2x

Front

What is the product of two numbers?

Back

The product is the result of multiplying two or more numbers together.

Front

How do you write '5 less than a number y' as an expression?

Back

y - 5

Front

What is the difference between an expression and an equation?

Back

An expression does not have an equality sign, while an equation states that two expressions are equal.

Front

How do you write 'the sum of a number x and 10' as an expression?

Back

x + 10

Front

What does 'evaluate 3x + 4 when x = 2' mean?

Back

It means to substitute 2 for x in the expression and calculate: 3(2) + 4 = 10.

Front

What is the value of b^2 + 4 when b = 3?

Back

13