Remember Length x Width x Height just multiply them
For this case we must represent the following expression algebraically:
"eight more than the product of a number and two"
Let "x" be the variable that represents the unknown number
We have to:
the product of a number and two is represented as: 
Then, the full expression will be:

Thus, we use multiplication and addition.
ANswer:
Option C
Consider, please, this solution. If it is possible, check it in the alternative sources.
0.8 - 0.45= 0.35
The nail polish hold 0.35 more ounces than the bottle of perfume.