To simplify this, we just have to multiply each of these values together. We don't have to worry about the order--we just have to multiply them correctly.
To help us multiply these values more easily, we can multiply -5 and -2 to get 10. Since it's each to multiply things by ten (you just move the decimal point one place to the right).
Now we have to multiply -8.5 and 10. Moving the decimal point one place to the right, we get our answer of -85.
