Explanation:
1. When you substitute
2. To evaluate a + 3 when a = 7, you can substitute 7 for a.
3. The set of rules used to determine the order in which operations are performed is called the order of operations.
4. Each part of an expression that is separated by a plus or minus sign is a term.
5. A(n) expression is a mathematical phrase that can contain numbers, variables, and operation symbols.
6. When two numbers are multiplied to get a product, each number is called a factor.