Final answer:
The operators described are the unary minus (-) for changing the sign of a value, the decrement operator (--) for decreasing a value by one, the logical NOT (!) for inverting a Boolean value, a neutral (identity) operator that has no effect, and the subtraction operator (-) for subtracting two values.
Step-by-step explanation:
The description of operators provided relate to different mathematical operations. Here are the operators that match the descriptions:
- a. Changes the sign of the value: The unary minus (-) operator. It changes the sign of its operand. For instance, if a number is positive, it becomes negative, and vice versa.
- b. Decreases the value by one: The decrement operator (--). This operator reduces the value of a variable by one.
- c. Inverts the value of the Boolean variable of the expression: The logical NOT operator (!). In programming, it inverts the truthiness of a Boolean value.
- d. Has no effect: The neutral operator is a bit tricky since it's not commonly referred to as an operator. But technically, the identity operator (which could be a no-operation symbol in some contexts) does not change the value.
- e. Subtracts the right operand from the left operand and returns the value: The subtraction operator (-). It takes two numbers and subtracts the second number (right operand) from the first number (left operand).