Operators and their precedence.
Expressions use arithmetic operators. As you recall from the first lesson, operators are symbols or words that perform actions on your data.
Some arithmetic operators can also be used to combine (or concatenate) text fields, but in this course you'll learn about using operators with values.
You'll probably use the operators for addition (+), subtraction (-), multiplication (*), and division (/) most often, but it's helpful to know about the other operators and their purpose.