What is the value of the postfix expression 6 3 2 4 + – *?14074-18

The postfix expression "6 3 2 4 + - *" is evaluated as follows:

1. Start from the left, go through the expression one number or operator at a time.
2. If it's a number, push it to the stack. If it's an operator, pop elements from the stack, perform the operation, and push the result back to the stack.
3. At the end, the stack will contain the result of the expression.

Let's evaluate your expression:

1. Push 6 to the stack.
2. Push 3 to the stack.
3. Push 2 to the stack.
4. Push 4 to the stack.
5. Encounter "+", so pop 4 and 2, add them, and push the result (6) back to the stack.
6. Encounter "-", so pop 6 and 3, subtract 6 from 3, and push the result (-3) back to the stack.
7. Encounter "*", so pop -3 and 6, multiply them, and push the result (-18) back to the stack.

So, the value of the postfix expression "6 3 2 4 + - *" is -18.