Evaluate Expressions with Variables

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 their given values.

Front

What is the order of operations in mathematics?

Back

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

Front

How do you substitute a variable in an expression?

Back

To substitute a variable, replace the variable with its given numerical value and then simplify the expression.

Front

What is the result of evaluating the expression 4(f-5) when f=7?

Back

The result is 8.

Front

How do you simplify the expression 2n + 3 + n?

Back

Combine like terms: 2n + n = 3n, so the expression simplifies to 3n + 3.

Front

What is the value of the expression 7 - (2g) when g=1?

Back

The value is 5.

Front

What does 'None of the above' mean in the context of multiple-choice questions?

Back

It indicates that none of the provided answer choices are correct.

Front

How do you evaluate the expression n/3 when n=12?

Back

Substitute 12 for n: 12/3 = 4.

Front

What is a variable in mathematics?

Back

A variable is a symbol, often a letter, that represents an unknown value in an expression or equation.