The term "product" refers to the answer that you get when you multiply two numbers together. So you are being asked to multiply -5 by 20.

So then what you need to do is first just multiply 5 by 20. That, as you know, is 100.

But you have to remember that you have a negative sign in front of your 5. When you multiply a negative by a positive, the rule is that your product must be negative.

So when you mulitply -5 by 20, you just take 5 times 20, which is 100, and put a negative sign in front of it.

So -5(20) = -100