Afuel oil distributor has 120,000 gallons of fuel with 0.9%
sulfur content, which exceeds pollution control standards of 0.8%
sulfur content. how many gallons of fuel oil with a 0.3% sulfur
content must be added to the 120,000 gallons to obtain fuel oil that
will comply with the pollution control standards?

Look, when you want to do something like put it like x^2. x2 could mean x² or x₂. so to clear confusion, know the notation. to find the product multiply the x's and you get -8x and the y's and you get 6y. since it's all being multiplied it is just -8x6y, or answer a. although the better answer is -48xy(combining -8 and 6) because you should multiply constants whenever you can.