Substitution

Front

What is the order of operations in mathematics?

Back

The order of operations is a set of rules that determines the sequence in which calculations are performed. The acronym PEMDAS is often used: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).

Front

What is substitution in algebra?

Back

Substitution in algebra is the process of replacing a variable with a number or another expression to simplify or solve an equation.

Front

How do you evaluate an expression with multiple operations?

Back

To evaluate an expression with multiple operations, follow the order of operations (PEMDAS) to determine which operations to perform first.

Front

What is the value of h^2 if h = 7?

Back

If h = 7, then h^2 = 7^2 = 49.

Front

If a = 6 and b = 7, what is the value of 15 - a - b?

Back

If a = 6 and b = 7, then 15 - a - b = 15 - 6 - 7 = 2.

Front

How do you find the value of an expression when given a variable?

Back

To find the value of an expression when given a variable, substitute the value of the variable into the expression and perform the calculations.

Front

What is the value of 7x - 1 if x = 5?

Back

If x = 5, then 7x - 1 = 7(5) - 1 = 35 - 1 = 34.

Front

If a = 4 and b = 6, what is the value of 3a + 5b?

Back

If a = 4 and b = 6, then 3a + 5b = 3(4) + 5(6) = 12 + 30 = 42.

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by performing the operations indicated in the expression.

Front

What is the result of 12 ÷ 3 x 4?

Back

According to the order of operations, first perform the division: 12 ÷ 3 = 4, then multiply: 4 x 4 = 16.